Supply and Demand?

How do you solve this problem?

The Sunshine Bakery sell pies at a fixed price of p per pie. The total number of pies demanded on a daily basis. D is related to the price, p, by the equation:

D = -10 + 200

On the other foot, the day after day supply of pies. S, is related to the price p per pie by the equation:

S = 15p -50


Determine the equilibrium price of pies, i.e., the price at which the Supply S and Demand D are equal

Answers:
The knob is to set emergency = to supply. So contained by this grip it would be -10+ 200=15p-50. Solve algebraically. Add 50 to the moved out side getting 240=15p. Divide 240 by 15 so p= 16. However, I would check the problem again as emergency is normally a function of price (It is price elastic) Perhaps it be -10p+200=15p-50? If so solve algebraically. In this skin P = 10. If you requirement to find the equilibrium amount plug the price into any side of the equation, or plug it into both to check your answer.
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