Following are three sample equations. Plot them on a graph in which Q is on the vertical axis and P is on the horizontal axis. Then transform these equations so P is expressed in terms of Q and plot these transformed equations on a graph in which P is on the vertical axis and Q is on the horizontal axis.

a. Q = 250 - 10P

b. Q = 1,300 - 140P

c. Q = 45 - 0.5P