Solve for x
x=-\frac{y}{2}+10
Solve for y
y=20-2x
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20-2x=y
Swap sides so that all variable terms are on the left hand side.
-2x=y-20
Subtract 20 from both sides.
\frac{-2x}{-2}=\frac{y-20}{-2}
Divide both sides by -2.
x=\frac{y-20}{-2}
Dividing by -2 undoes the multiplication by -2.
x=-\frac{y}{2}+10
Divide y-20 by -2.
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