bantuuu dongg

<p>Saya bantu jawab ya.................</p><p>&nbsp;</p><p>f(x) = ax + b</p><p>f(10) = &nbsp; &nbsp;780 --&gt; 10a + b = 780 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (1)</p><p>f(30) = 2.280 --&gt; <u>30a + b = 2.280</u> _ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(2)</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;-20a &nbsp; &nbsp; &nbsp; = -1.500</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; a = -1.500/-20</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;a = 75</p><p>Substitusikan a = 75 ke persamaan (1)</p><p>10a + b = &nbsp;780</p><p>10(75) + b = 780</p><p>750 + b = 780</p><p>b = 780 - 750</p><p>b = 30</p><p>&nbsp;</p><p>a. Rumus fungsi</p><p>&nbsp; &nbsp; &nbsp;Substitusikan a = 75 dan b = 30 ke f(x) = ax + b</p><p>&nbsp; &nbsp; &nbsp;Rumus fungsinya<strong> f(x) = 75x + 30</strong></p><p>&nbsp;</p><p>b. Menentukan x = 240 detik</p><p>&nbsp; &nbsp; &nbsp;f(240) = 75(240) + 30</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 18.000 + 30</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 18.030 meter</p><p>&nbsp; &nbsp; &nbsp;Jadi, panjang lintasannya adalah <strong>18.030 meter</strong></p>