gunakan metode gabungan 2x-3y=8 X+y=9

<p>Pembahasan: 2x - 3y = 8</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; x + y = 9</p><p>Eliminasi x (Samakan koefisien x)&nbsp;</p><p>2x - 3y = 8&nbsp;</p><p>2x + 2y =18</p><p>_________________ - &nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; - 5y = - 10</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;_________________ ÷ -5</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Y = 2</p><p>Substitusi ( Ubah y = 2)</p><p>&nbsp;x + y = 9</p><p>x + 2 = 9</p><p>____________ - 2</p><p>&nbsp; &nbsp; &nbsp; &nbsp;x = 7</p><p>Penyelesaian &nbsp;(x, y) = (7,2)</p><p>&nbsp;</p>