Solve for y
y=-\frac{x}{2}+20
Solve for x
x=40-2y
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2y=40-x
Subtract x from both sides.
\frac{2y}{2}=\frac{40-x}{2}
Divide both sides by 2.
y=\frac{40-x}{2}
Dividing by 2 undoes the multiplication by 2.
y=-\frac{x}{2}+20
Divide 40-x by 2.
x=40-2y
Subtract 2y from both sides.
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