Solve for x
x=20-2y
Solve for y
y=-\frac{x}{2}+10
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20x=400-40y
Subtract 40y from both sides.
\frac{20x}{20}=\frac{400-40y}{20}
Divide both sides by 20.
x=\frac{400-40y}{20}
Dividing by 20 undoes the multiplication by 20.
x=20-2y
Divide 400-40y by 20.
40y=400-20x
Subtract 20x from both sides.
\frac{40y}{40}=\frac{400-20x}{40}
Divide both sides by 40.
y=\frac{400-20x}{40}
Dividing by 40 undoes the multiplication by 40.
y=-\frac{x}{2}+10
Divide 400-20x by 40.
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