2. There is no demand for an item when the price is $800. However, there is a demand for 100 items when the price is $600. The supplier will not provide any of the items if the unit price is $300 or below. The supplier will provide 150 items when the unit price is $375. a. Write the demand equation. Hint, let x be items and y be $. b. Write the supply equation. Hint, let x be items and y be $. d. Sketch the graph of supply and demand functions, and find the equilibrium point.