Solve for y
y=-\frac{x}{20}+50
Solve for x
x=1000-20y
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20y=1000-x
Subtract x from both sides.
\frac{20y}{20}=\frac{1000-x}{20}
Divide both sides by 20.
y=\frac{1000-x}{20}
Dividing by 20 undoes the multiplication by 20.
y=-\frac{x}{20}+50
Divide 1000-x by 20.
x=1000-20y
Subtract 20y from both sides.
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