Solve for p_100
p_{100}=-\frac{Q}{10}+20
Solve for Q
Q=200-10p_{100}
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200-10p_{100}=Q
Swap sides so that all variable terms are on the left hand side.
-10p_{100}=Q-200
Subtract 200 from both sides.
\frac{-10p_{100}}{-10}=\frac{Q-200}{-10}
Divide both sides by -10.
p_{100}=\frac{Q-200}{-10}
Dividing by -10 undoes the multiplication by -10.
p_{100}=-\frac{Q}{10}+20
Divide Q-200 by -10.
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