Solve for x
x=-\frac{y}{2}+90
Solve for y
y=180-2x
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2x=180-y
Subtract y from both sides.
\frac{2x}{2}=\frac{180-y}{2}
Divide both sides by 2.
x=\frac{180-y}{2}
Dividing by 2 undoes the multiplication by 2.
x=-\frac{y}{2}+90
Divide 180-y by 2.
y=180-2x
Subtract 2x from both sides.
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