Solve for x
x=\frac{y-12}{4}
Solve for y
y=4\left(x+3\right)
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4x=y-12
Swap sides so that all variable terms are on the left hand side.
\frac{4x}{4}=\frac{y-12}{4}
Divide both sides by 4.
x=\frac{y-12}{4}
Dividing by 4 undoes the multiplication by 4.
x=\frac{y}{4}-3
Divide y-12 by 4.
y=4x+12
Add 12 to both sides.
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