jawab dengan cara please

<p>pakai spldv</p><p>3x+5y=61</p><p>4x-3y=4</p><p>---------------</p><p>samakan nilai salah satu dari x atau y, misal, x:</p><p>4(3x+5y=61)</p><p>3(4x-3y=4)</p><p>=</p><p>12x+20y= 244</p><p>12x-9y= 12</p><p>------------------- -</p><p>0 + 29y = 232</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;y = 232/29</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=8</p><p>ok ketemu nih y, cari x sekarang. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;check: 4(7)-3(8)= 28-24=4 benar.</p><p>3x+5y= 61</p><p>3x+5(8)= 61</p><p>3x+ (40)= 61</p><p>3x= 61-40</p><p>3x= 21</p><p>x= 7</p><p>&nbsp;</p><p>ditanya: berapa 2x-y?</p><p>&nbsp; &nbsp; &nbsp; &nbsp;2(7)-8</p><p>&nbsp; &nbsp; &nbsp;=14-8</p><p>&nbsp; &nbsp; &nbsp;=6</p>