tolonh bantu

<p>Jawaban yang tepat adalah <strong>a = 2</strong> dan <strong>b = 5</strong></p><p>&nbsp;</p><p>Pembahasan :</p><p>(x,y) = (-3,2)</p><p>ax + by = 4</p><p>-3a + 2b = 4 &nbsp; &nbsp; &nbsp; (1)</p><p>&nbsp;</p><p>-2ax - by = 2</p><p>-2a(-3) - 2b = 2</p><p>6a - 2b = 2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;(2)</p><p>&nbsp;</p><p>Eliminasi b untuk mendapatkan nilai a</p><p>-3a + 2b = 4&nbsp;</p><p>&nbsp;<u>6a &nbsp;- 2b = 2&nbsp;</u> +</p><p>3a &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 6</p><p>a = 6 : 3 = 2</p><p>&nbsp;</p><p>Substitusikan a = 2 ke persamaan (1)</p><p>-3a + 2b = 4</p><p>-3(2) + 2b = 4</p><p>-6 + 2b = 4</p><p>2b = 4 + 6</p><p>2b = 10</p><p>b = 10 : 2</p><p>b = 5</p><p>&nbsp;</p><p>Jadi, &nbsp;a = 2 dan b = 5</p>