Solve for P
P=-\frac{Q}{4}+15
Solve for Q
Q=60-4P
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60-4P=Q
Swap sides so that all variable terms are on the left hand side.
-4P=Q-60
Subtract 60 from both sides.
\frac{-4P}{-4}=\frac{Q-60}{-4}
Divide both sides by -4.
P=\frac{Q-60}{-4}
Dividing by -4 undoes the multiplication by -4.
P=-\frac{Q}{4}+15
Divide Q-60 by -4.
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