Solve for x
x=\frac{y+40}{2}
Solve for y
y=2\left(x-20\right)
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2x-40=y
Swap sides so that all variable terms are on the left hand side.
2x=y+40
Add 40 to both sides.
\frac{2x}{2}=\frac{y+40}{2}
Divide both sides by 2.
x=\frac{y+40}{2}
Dividing by 2 undoes the multiplication by 2.
x=\frac{y}{2}+20
Divide y+40 by 2.
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