Solve for Q
Q=-\frac{P}{2}+10
Solve for P
P=20-2Q
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2Q=20-P
Subtract P from both sides.
\frac{2Q}{2}=\frac{20-P}{2}
Divide both sides by 2.
Q=\frac{20-P}{2}
Dividing by 2 undoes the multiplication by 2.
Q=-\frac{P}{2}+10
Divide 20-P by 2.
P=20-2Q
Subtract 2Q from both sides.
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