An important application of systems of equations arises in connection with supply and demand. As the price of a product increases, the demand for that produce decreases. However, at higher prices, suppliers are willing to produce greater quantities of the product. Suppose a chain of electronics stores sells tablets. The weekly demand and supply models are given as follows

Demand model: Supply model: N=?7p+4550N=2.1p

where N is the number of tablets sold each week and at price p. (Note: Answer with the appropriate units.)

a) How many tablets can be supplied at $ 420 per tablet? Answer:

b) How many tablets will be sold when supply and demand are equal? Answer:

c) Find the price at which supply and demand are equal. Answer: