Solve for y
y=-\frac{x}{2}+40
Solve for x
x=80-2y
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2y=80-x
Subtract x from both sides.
\frac{2y}{2}=\frac{80-x}{2}
Divide both sides by 2.
y=\frac{80-x}{2}
Dividing by 2 undoes the multiplication by 2.
y=-\frac{x}{2}+40
Divide 80-x by 2.
x=80-2y
Subtract 2y from both sides.
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