3 years ago

Solve using systems of equations. -3x-4y=-8 3x+3y=9

1 answer:

8 0

Sure thing!

$-3x-4y=-8\\
 3x+3y=9\\
----------\\
0x-1y=1\\
y=-1\\

$

since y = -1 we can just plug it into the first equation
$-3x-4(-1)=-8\\
-3x+4=-8\\
-3x=-12\\
x=4$

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