Solve for x
x=\frac{y-20}{2}
Solve for y
y=2\left(x+10\right)
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-2x=20-y
Subtract y from both sides.
\frac{-2x}{-2}=\frac{20-y}{-2}
Divide both sides by -2.
x=\frac{20-y}{-2}
Dividing by -2 undoes the multiplication by -2.
x=\frac{y}{2}-10
Divide 20-y by -2.
y=20+2x
Add 2x to both sides.
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