Solve for x
x=\frac{y-20}{4}
Solve for y
y=4\left(x+5\right)
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4x+20=y
Swap sides so that all variable terms are on the left hand side.
4x=y-20
Subtract 20 from both sides.
\frac{4x}{4}=\frac{y-20}{4}
Divide both sides by 4.
x=\frac{y-20}{4}
Dividing by 4 undoes the multiplication by 4.
x=\frac{y}{4}-5
Divide y-20 by 4.
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