3 years ago

Solve system by elimination -16x-9y=20 8x+2y=0

1 answer:

5 0

$\left \{ {{-16x-9y=20} \atop {8x+2y=0\ \ | *2}} \right. \\\\ \left \{ {{-16x-9y=20} \atop {16x+4y=0}} \right. \\+------\\\\
-5y=20\ \ \ | divide\ by\ -5\\\\
y=-4\\\\
16x=-4y\ \ \ | divide\ by\ 16\\\\
x=-\frac{1}{4}y=-\frac{1}{4}*(-4)=1$

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Source:
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