Solve for P
P=-\frac{Q}{15}+120
Solve for Q
Q=1800-15P
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1800-15P=Q
Swap sides so that all variable terms are on the left hand side.
-15P=Q-1800
Subtract 1800 from both sides.
\frac{-15P}{-15}=\frac{Q-1800}{-15}
Divide both sides by -15.
P=\frac{Q-1800}{-15}
Dividing by -15 undoes the multiplication by -15.
P=-\frac{Q}{15}+120
Divide Q-1800 by -15.
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