Question: 2 variable ?

Question:2 variable ?

Jp 48 Maple
ok me again, I have this economic problem. Dc( pc , pt ) = 2000+1000*pt-2*pc Sc (pc) = 23*pc how can I plot this, and If I don't know what the value of (pt), can I still plot this? thank you so very much in advance.
Please Wait...