Solve for x
x=-\frac{y_{1}}{20}+1
Solve for y_1
y_{1}=20-20x
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20x=20-y_{1}
Subtract y_{1} from both sides.
\frac{20x}{20}=\frac{20-y_{1}}{20}
Divide both sides by 20.
x=\frac{20-y_{1}}{20}
Dividing by 20 undoes the multiplication by 20.
x=-\frac{y_{1}}{20}+1
Divide 20-y_{1} by 20.
y_{1}=20-20x
Subtract 20x from both sides.
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