I was given Q = 400-2p, and I need to solve for P. The answer I arrived at is P = Q + 200. Is that correct?
Hello scaliva21.
$\displaystyle Q=400-2p$
Since you want to solve for p, you have to isolate it, so you subtract 400 from both sides.
$\displaystyle Q-400=-2p$
and in order to continue isolation of p, you have to divide both sides by -2.
$\displaystyle \frac{Q-400}{-2}=p$ -> $\displaystyle p=\frac{Q}{-2}+\frac{-400}{-2}$ -> $\displaystyle p=200-\frac{Q}{2}$