Solve for x
x=\frac{1-y}{90}
Solve for y
y=1-90x
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90x=1-y
Subtract y from both sides.
\frac{90x}{90}=\frac{1-y}{90}
Divide both sides by 90.
x=\frac{1-y}{90}
Dividing by 90 undoes the multiplication by 90.
y=1-90x
Subtract 90x from both sides.
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Limits
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