tentukan rumus dari diagram panah diatas

<p>Jawaban yang tepat adalah <strong>f(x) = 2x + 3</strong></p><p>&nbsp;</p><p>Pembahasan :</p><p>Rumus umum fungsi adalah&nbsp;</p><p>f(x) = ax + b</p><p>&nbsp;</p><p>f(5) = 13 --&gt; 5a + b = 13 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (1)</p><p>f(6) = 15 --&gt; <u>6a + b = 15</u> _ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(2)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; -a &nbsp; &nbsp; &nbsp; &nbsp; = -2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; a = 2</p><p>Substitusikan a = 2 ke persamaan (1)</p><p>5a + b = 13</p><p>5(2) + b = 13</p><p>10 + b = 13</p><p>b = 13 - 10</p><p>b = 3</p><p>&nbsp;</p><p>Substitusikan a = 2 dan b = 3 ke persamaan rumus umum</p><p>f(x) = ax + b</p><p>f(x) = 2x + 3</p><p>Jadi rumus fungsinya adalah <strong>f(x) = 2x + 3</strong></p>