Solve the system by substitution
We have equations :-3x+4y= -1, 4x+8y= -12.
Let us isolate equation (2) for x first.
Dividing equation (2) by 4 .
Then subtracting 2y on both sides.
Substituting x=-3-2y in first equation -3x+4y=-1 and solve for y.
We got y=-1.
Plugging y=-1 in x=-3-2...
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