no 3 aja

<p>ok, saya bantu jawab ya....</p><p>&nbsp;</p><p>f(x) = ax + b</p><p>&nbsp;</p><p>1. <strong>Menentukan persamaan fungsi</strong></p><p>&nbsp; &nbsp; &nbsp;f(-3) = -15 --&gt; -15 = -3a + b &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (1)</p><p>&nbsp; &nbsp; &nbsp;f(3) = 9 &nbsp; &nbsp; &nbsp; --&gt; &nbsp;<u> &nbsp; 9 = 3a + b &nbsp;&nbsp;</u> _ &nbsp; &nbsp; &nbsp;(2)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; -24 = -6a</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; a = -24/-6</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; a = 4</p><p>&nbsp; &nbsp; &nbsp; Substitusikan a = 4 ke persamaan (2)</p><p>&nbsp; &nbsp; &nbsp; &nbsp;9 = 3a + b</p><p>&nbsp; &nbsp; &nbsp; &nbsp;9 = 3(4) + b</p><p>&nbsp; &nbsp; &nbsp; &nbsp;9 = 12 + b</p><p>&nbsp; &nbsp; &nbsp; &nbsp;9 - 12 = b</p><p>&nbsp; &nbsp; &nbsp; &nbsp; b = -3</p><p>&nbsp; &nbsp; &nbsp; &nbsp;Substitusikan a = 4 dan b = -3 ke rumus umum fungsi</p><p>&nbsp; &nbsp; &nbsp; &nbsp;f(x) = ax + b</p><p>&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<strong>f(x) = 4x - 3</strong></p><p><strong>&nbsp; &nbsp; &nbsp; &nbsp;&nbsp;</strong>Jadi, persamaan fungsinya adalah f(x) = 4x - 3</p><p>&nbsp;</p><p>b. Menentukan nilai f(-5) + f(5)</p><p>&nbsp; &nbsp; &nbsp;f(-5) = 4(-5) - 3</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= -20 - 3</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= -23</p><p>&nbsp; &nbsp; &nbsp;f(5) = 4(5) - 3</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 20 - 3</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 17</p><p>&nbsp; &nbsp; &nbsp;f(-5) + f(5) = -23 + 17 = -6</p><p>&nbsp; &nbsp; &nbsp;Jadi, nilai f(-5) + f(5) adalah -6</p><p>&nbsp;</p><p>3. Domain = {-2,-1, 1, 2}</p><p>&nbsp; &nbsp; &nbsp;f(x) = 4x - 3</p><ul><li>x = -2 --&gt; f(-2) = 4(-2) - 3 = -8 - 3 = -11</li><li>x = -1 --&gt; f(-1) = 4(-1) - 3 = -4 - 3 = -7</li><li>x = 1 --&gt; f(1) = 4(1) - 3 = 4 - 3 = 1</li><li>x = 2 --&gt; f(2) = 4(2) - 3 = 8 - 3 = 5</li></ul><p>&nbsp; &nbsp; &nbsp;</p>