Solve for x
x=\frac{y-12}{4}
Solve for y
y=4\left(x+3\right)
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-4x=12-y
Subtract y from both sides.
\frac{-4x}{-4}=\frac{12-y}{-4}
Divide both sides by -4.
x=\frac{12-y}{-4}
Dividing by -4 undoes the multiplication by -4.
x=\frac{y}{4}-3
Divide 12-y by -4.
y=12+4x
Add 4x to both sides.
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