D = Demand (# of copies)
S = Supply (# of copies)
p = price in cents
======================
D = 2200 - 120 p
S = 600 + 40 p
Although they didn't ask for it,
D = S when 1600 = 160 p
p = 10 cents
The demand for your college newspaper is 2200 copies each week if the paper is given away free of charge and drops to 1000 each week if the charge is 10/copy. However, the university is only prepared to supply 600 copies each week free of charge but will supply 1400 each week at 20/copy.
Write down the associated linear demand function.
Write down the associated linear supply function.
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