To plot the graph, we need to find the quantity demanded (Qd) at different price levels.
At P = $60, Qd = 240 - 4*60 = 0
At P = $0, Qd = 240 - 4*0 = 240
So, the graph will start at the point (0,60) and end at the point (240,0). The graph will be a straight line
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