{"id":284889,"date":"2020-09-29T21:17:20","date_gmt":"2020-09-29T14:17:20","guid":{"rendered":"https:\/\/quipperhome.wpcomstaging.com\/?p=284889"},"modified":"2023-02-07T15:42:47","modified_gmt":"2023-02-07T08:42:47","slug":"relasi-dan-fungsi-matematika-g8","status":"publish","type":"post","link":"https:\/\/quipperhome.wpcomstaging.com\/mapel\/matematika\/relasi-dan-fungsi-matematika-g8\/","title":{"rendered":"Relasi dan Fungsi &#8211; Matematika G8"},"content":{"rendered":"<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-284902\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-Matematika-G8.png\" alt=\"Relasi dan Fungsi\" width=\"800\" height=\"533\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-Matematika-G8.png 800w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-Matematika-G8-768x512.png 768w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-Matematika-G8-585x390.png?crop=1 585w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-Matematika-G8-263x175.png?crop=1 263w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-Matematika-G8-300x200.png 300w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Hai Quipperian, bagaimana kabarnya? Semoga selalu sehat dan tetap semangat belajar, ya.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Misal di depanmu ada garam, gula, lada, cuka, dan pare. Lalu kamu diminta untuk menyebutkan rasa masing-masing bahan tersebut.&nbsp; Sudah pasti kamu akan mendapatkan skor 100, ya. Saat diminta menyebutkan rasa garam, sudah pasti asin, gula pasti manis, lada pasti pedas, dan pare pasti pahit.&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Apakah mungkin garam terasa manis? Tentu tidak ya. <\/span><em><span style=\"font-weight: 400;\">Nah<\/span><\/em><span style=\"font-weight: 400;\">, ternyata hal-hal sepele semacam itu bisa dinyatakan dalam bentuk matematis, <\/span><em><span style=\"font-weight: 400;\">lho<\/span><\/em><span style=\"font-weight: 400;\">. Bentuk matematis yang dimaksud adalah fungsi. Apa itu fungsi? Simak penjelasannya di artikel ini ya.<\/span><\/p>\n<h2><strong>Pengertian Relasi<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Pak Bejo memiliki empat anak, yaitu Putri, Sella, Bayu, dan Anggi. Masing-masing anak memiliki hobi yang berbeda-beda. Contohnya, Putri hobi berenang, Sella hobi berenang dan menggambar, Bayu hobi bermain bola, dan Anggi hobi bersepeda.&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Anak Pak Bejo dan hobinya bisa dijadikan suatu himpunan yang nantinya kedua himpunan tersebut memiliki keterkaitan satu sama lain. Misalnya, anak Pak Bejo dikelompokkan dalam himpunan A dan hobi setiap anak dikelompokkan dalam himpunan B.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A = {Putri, Sella, Bayu, Anggi}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B = {Berenang, Menggambar, Bermain Bola, Bersepeda}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Hubungan antara himpunan A dan B berkaitan dengan hobi anak-anak Pak Bejo.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Putri hobi berenang<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Sella hobi berenang dan menggambar<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Bayu hobi bermain bola<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Anggi hobi bersepeda<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Nah, jika kata <\/span><strong>hobi<\/strong> <span style=\"font-weight: 400;\">diganti dinyatakan dengan anak panah, akan diperoleh bentuk berikut.<\/span><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-284900\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-1.png\" alt=\"\" width=\"408\" height=\"275\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-1.png 408w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-1-300x202.png 300w\" sizes=\"(max-width: 408px) 100vw, 408px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Bentuk diagram panah di atas menunjukkan adanya hubungan atau relasi antara himpunan A dan B. Relasi antara keduanya adalah hobi. Dalam dunia matematika, keadaan tersebut dinamakan sebagai relasi himpunan A ke himpunan B. Jadi, menurut Quipperian relasi itu apa sih?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Relasi dari himpunan A ke himpunan B artinya aturan yang memasangkan\/menghubungkan setiap anggota himpunan A dan anggota himpunan B.<\/span><\/p>\n<h2><strong>Menyatakan Relasi<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Untuk menyatakan relasi, kamu bisa menggunakan tiga cara, yaitu dengan diagram panah, himpunan pasangan berurutan, dan koordinat Cartesius. Adapun bentuk ketiganya adalah sebagai berikut.<\/span><\/p>\n<h3><strong>1. Diagram panah<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Bentuk diagram panah ini adalah bentuk yang umum digunakan di soal-soal tentang relasi. Ciri utama diagram panah adalah adanya dua kolom terpisah di mana masing-masing kolom berisi himpunan yang bersesuaian. Lalu, kedua kolom tersebut dihubungkan dengan anak panah. Perhatikan contoh di bawah ini.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">S = {Sapi, Kambing, Kera, Harimau}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">P = {Rumput, Pisang, Daging}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dua himpunan di atas memiliki relasi, yaitu makanan. Jika dinyatakan dalam bentuk diagram panah, akan menjadi seperti berikut.<\/span><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-284899\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-2.png\" alt=\"\" width=\"432\" height=\"300\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-2.png 432w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-2-300x208.png 300w\" sizes=\"(max-width: 432px) 100vw, 432px\" \/><\/p>\n<h3><strong>2. Himpunan pasangan berurutan<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Himpunan pasangan berurutan menyatakan bahwa setiap himpunan terdiri dari anggota himpunan S dan P secara berurutan atau biasa dilambangkan (<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\">, <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em><span style=\"font-weight: 400;\">) dengan <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">\u2208<\/span><span style=\"font-weight: 400;\"> S, <\/span><em><span style=\"font-weight: 400;\">y<\/span><\/em> <span style=\"font-weight: 400;\">\u2208<\/span><span style=\"font-weight: 400;\"> P. Berikut ini contohnya.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">S = {Sapi, Kambing, Kera, Harimau}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">P = {Rumput, Pisang, Daging}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Relasi antara kedua himpunan tersebut adalah makanan. Jika dinyatakan dalam bentuk himpunan pasangan berurutan, diperoleh:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Q = {(Sapi, Rumput), (Kambing, Rumput), (Kera, Pisang), (Harimau, Daging)}<\/span><\/p>\n<h3><strong>3. Koordinat Cartesius<\/strong><\/h3>\n<p><span style=\"font-weight: 400;\">Pernahkah Quipperian belajar tentang sistem koordinat Cartesius? Koordinat Cartesius memiliki dua sumbu, yaitu sumbu X dan Y. Setiap anggota himpunan kamu letakkan di titik yang bersesuaikan, dengan ketentuan himpunan S berada di sumbu X dan himpunan P berada di sumbu Y, seperti berikut ini.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284898\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-3.png\" alt=\"\" width=\"354\" height=\"277\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-3.png 354w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-3-300x235.png 300w\" sizes=\"(max-width: 354px) 100vw, 354px\" \/><\/p>\n<h2><strong>Pengertian Fungsi<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Di awal artikel kamu sudah diminta untuk menyebutkan rasa beberapa bumbu dapur, kan? Misalnya garam pasti asin, gula pasti manis, cuka pasti asam, lada pasti pedas, dan pare pasti pahit. Jika dinyatakan dalam bentuk diagram panah, akan menjadi seperti berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B = {Garam, Gula, Lada, Cuka, Pare}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C = {Asin, Manis, Pedas, Asam, Pahit}<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284897\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-4.png\" alt=\"\" width=\"457\" height=\"297\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-4.png 457w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-4-300x195.png 300w\" sizes=\"(max-width: 457px) 100vw, 457px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Jika kamu perhatikan, setiap anggota himpunan B berpasangan dengan satu anggota himpunan C. Artinya, setiap anggota himpunan B hanya memiliki satu pasang di himpunan C. Nah, kondisi seperti ini disebut sebagai fungsi (pemetaan).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dengan demikian, fungsi adalah aturan yang memasangkan setiap anggota himpunan B tepat dengan satu anggota himpunan C.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dari penjelasan di atas, hal apa yang bisa Quipperian simpulkan?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Setiap fungsi merupakan relasi. Akan tetapi, tidak setiap fungsi menunjukkan relasi. Fungsi adalah bentuk relasi yang memenuhi syarat tertentu, yaitu setiap anggota himpunan asal harus memiliki satu pasang anggota himpunan hasil.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Perhatikan kembali himpunan berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">B = {Garam, Gula, Lada, Cuka, Pare}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">C = {Asin, Manis, Pedas, Asam, Pahit}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Himpunan B disebut sebagai daerah asal (domain). Sementara himpunan C disebut sebagai daerah hasil (kodomain).<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Oleh karena fungsi termasuk relasi, maka fungsi bisa dinyatakan dalam bentuk diagram panah, himpunan pasangan berurutan, dan koordinat Cartesius.<\/span><\/p>\n<h2><strong>Menghitung Nilai Fungsi<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Jika kamu menemui diagram panah seperti berikut, kira-kira apa hubungan antara domain dan kodomainnya ya?<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284896\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-5.png\" alt=\"\" width=\"376\" height=\"266\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-5.png 376w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-5-300x212.png 300w\" sizes=\"(max-width: 376px) 100vw, 376px\" \/><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Untuk sembarang anggota A, misalnya 2, daerah hasil yang ditunjuk adalah 3.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Untuk sembarang anggota A, misalnya 3, daerah hasil yang ditunjuk adalah 5 dan seterusnya.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Kira-kira, apa hubungan antara himpunan A dan B?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Himpunan B merupakan 2 \u00d7 anggota himpunan A \u2013 1. Secara matematis, dinyatakan sebagai berikut.<\/span><\/p>\n<p><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 2<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> \u2013 1<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jika relasi 2<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> \u2013 1 dinotasikan sebagai f, maka f memetakan <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> ke (2<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> \u2013 1). Secara matematis, ditulis sebagai berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">f: <\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em> <span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> (2<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> \u2013 1)<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Rumusan f(<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\">) = 2<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\"> \u2013 1 nantinya kamu kenal sebagai rumus fungsi.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Agar pemahamanmu tentang relasi dan fungsi semakin terasah, simak contoh soal berikut ini.<\/span><\/p>\n<h2><strong>Contoh Soal 1<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Perhatikan himpunan berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">I = {(1,2), (2, 3), (3,4), (4,5), (5,6)}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">II = {(1, 2), (1, 4), (3, 6), (4, 8)}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">III = {(2, 4), (3,6), (4,8)}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Himpunan yang merupakan fungsi ditunjukkan oleh nomor\u2026<\/span><\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">I dan III<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">I dan II<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">II dan III<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">I, II, dan III<\/span><\/li>\n<\/ol>\n<p><strong>Pembahasan:<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Syarat suatu himpunan dikatakan fungsi adalah sebagai berikut.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Setiap anggota himpunan A mempunyai pasangan di himpunan B<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Setiap anggota himpunan A memiliki pasangan tepat satu anggota himpunan B.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Dari kedua syarat tersebut, diperoleh:<\/span><\/p>\n<p><strong>Himpunan I<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Domain = {1, 2, 3, 4}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Kodomain = {2, 3, 4, 5, 6}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Relasi domain dan kodomainnya dinyatakan sebagai berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">1 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 2<\/span><\/p>\n<p><span style=\"font-weight: 400;\">2 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 3<\/span><\/p>\n<p><span style=\"font-weight: 400;\">3 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 4<\/span><\/p>\n<p><span style=\"font-weight: 400;\">4 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 5<\/span><\/p>\n<p><span style=\"font-weight: 400;\">5 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 6<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dengan demikian, himpunan I merupakan <\/span><em><span style=\"font-weight: 400;\">fungsi<\/span><\/em><span style=\"font-weight: 400;\"> karena semua anggota domain mempunyai pasangan tepat satu anggota kodomain.<\/span><\/p>\n<p><strong>Himpunan II<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Domain = {1, 3, 4}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Kodomain = {2, 4, 6, 8}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Relasi domain dan kodomainnya dinyatakan sebagai berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">1 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 2<\/span><\/p>\n<p><span style=\"font-weight: 400;\">1 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 4<\/span><\/p>\n<p><span style=\"font-weight: 400;\">3 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 6<\/span><\/p>\n<p><span style=\"font-weight: 400;\">4 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 8<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dengan demikian, himpunan II <\/span><em><span style=\"font-weight: 400;\">bukan fungsi<\/span><\/em><span style=\"font-weight: 400;\"> karena ada anggota domain yang memiliki pasangan dua anggota kodomain, yaitu 1 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 2 dan 1 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 4.<\/span><\/p>\n<p><strong>Himpunan III<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Domain = {2, 3, 4}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Kodomain = {4, 6, 8}<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Relasi domain dan kodomainnya dinyatakan sebagai berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">2 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 4<\/span><\/p>\n<p><span style=\"font-weight: 400;\">3 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 6<\/span><\/p>\n<p><span style=\"font-weight: 400;\">4 <\/span><span style=\"font-weight: 400;\">-&gt;<\/span><span style=\"font-weight: 400;\"> 8<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dengan demikian, himpunan III merupakan <\/span><em><span style=\"font-weight: 400;\">fungsi<\/span><\/em><span style=\"font-weight: 400;\"> karena semua anggota domain mempunyai pasangan tepat satu anggota kodomain.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, yang termasuk fungsi adalah himpunan I dan III.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jawaban: A<\/span><\/p>\n<h2><strong>Contoh Soal 2<\/strong><\/h2>\n<p><span style=\"font-weight: 400;\">Tinggi badan Dina setiap bulan mengalami kenaikan sebesar 15 mm. Umur Dina sekarang 3 tahun. Jika tinggi badan Dina sekarang adalah 98 cm, persentase pertambahan tinggi Dina dari usia 3 tahun sampai 6 tahun adalah\u2026<\/span><\/p>\n<ol style=\"list-style-type: upper-alpha;\">\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">55,30%<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">55,20%<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">55,10%<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">55,40%<\/span><\/li>\n<\/ol>\n<p><strong>Pembahasan:<\/strong><\/p>\n<p><span style=\"font-weight: 400;\">Diketahui:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tinggi badan Dina sekarang = <\/span><em><span style=\"font-weight: 400;\">b<\/span><\/em><span style=\"font-weight: 400;\"> = 98 cm.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Tiap bulan, tinggi badan Dina bertambah 15 mm = 1,5 cm = <\/span><em><span style=\"font-weight: 400;\">a<\/span><\/em><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Ditanya: Tinggi badan Dina pada umur 6 tahun =\u2026?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jawaban:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284895\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-6.png\" alt=\"\" width=\"306\" height=\"91\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-6.png 306w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-6-300x89.png 300w\" sizes=\"(max-width: 306px) 100vw, 306px\" \/><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Misalkan f(<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\">) = tinggi badan Dina pada bulan ke-<\/span><em><span style=\"font-weight: 400;\">x<\/span><\/em><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Berdasarkan hal itu, maka:<\/span><\/p>\n<p><span style=\"font-weight: 400;\"> <img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284894\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-7.png\" alt=\"\" width=\"200\" height=\"162\"><\/span><\/p>\n<p><span style=\"font-weight: 400;\">Persentase pertambahan tinggi Dina dari usia 3 tahun sampai 6 tahun adalah sebagai berikut.<\/span><\/p>\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-284893\" src=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-8.png\" alt=\"\" width=\"325\" height=\"138\" srcset=\"https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-8.png 325w, https:\/\/quipperhome.wpcomstaging.com\/wp-content\/uploads\/2020\/09\/Relasi-dan-Fungsi-8-300x127.png 300w\" sizes=\"(max-width: 325px) 100vw, 325px\" \/>&nbsp;<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jadi, pertambahan tinggi Dina dari usia 3 tahun sampai 6 tahun adalah 55,10%.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Jawaban: C<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Itulah pembahasan Quipper Blog tentang relasi dan fungsi. Semoga bermanfaat buat Quipperian. Meskipun masih di rumah saja, Quipperian harus giat belajar, ya. Jangan sampai ketidakhadiranmu di sekolah membuatmu lupa dengan kewajiban sebagai pelajar. Kini, belajar tak perlu ribet, cukup ambil <\/span><em><span style=\"font-weight: 400;\">handphone-<\/span><\/em><span style=\"font-weight: 400;\">mu lalu buka <\/span><a href=\"https:\/\/subscribe.quipper.com\/signup\/id\"><strong>Quipper Video<\/strong><\/a><span style=\"font-weight: 400;\">. Bersama Quipper Video, belajar jadi lebih mudah dan menyenangkan. Salam Quipper!<\/span><\/p>\n<p>sumber: <a href=\"https:\/\/learn.quipper.com\/en\/topics\/5c5127f85516b3001400cf08\/questions\/3\"><span style=\"font-weight: 400;\">https:\/\/learn.quipper.com<\/span><\/a><\/p>\n<p><strong>Penulis: Eka Viandari<\/strong><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hai Quipperian, bagaimana kabarnya? Semoga selalu sehat dan tetap semangat belajar, ya. Misal di depanmu ada garam, gula, lada, cuka, dan pare. Lalu kamu&hellip;<\/p>\n","protected":false},"author":99400369,"featured_media":284902,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[679384888,679384865],"tags":[],"ppma_author":[679386827,679386836],"class_list":["post-284889","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mapel","category-matematika"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Relasi dan Fungsi - Matematika G8 - Quipper Blog<\/title>\n<meta name=\"description\" content=\"Quipperian, kamu yang duduk di kelas 8 sudah paham dengan materi Relasi dan Fungsi belum? 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