Solve for b
b=-\frac{a}{2}+90
Solve for a
a=180-2b
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180-2b=a
Swap sides so that all variable terms are on the left hand side.
-2b=a-180
Subtract 180 from both sides.
\frac{-2b}{-2}=\frac{a-180}{-2}
Divide both sides by -2.
b=\frac{a-180}{-2}
Dividing by -2 undoes the multiplication by -2.
b=-\frac{a}{2}+90
Divide a-180 by -2.
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