The quantity demanded for good Z depends upon the price of Z (Pz), monthly income (Y), and price of a related good W (Pw). Demand for good z (Qz) is given by : Qz= 150 -8Pz + 2Y -15Pw.

A, Find the demand equation for good Z in terms of the price for Z (Pz), when Y is $50 and Pw is $6.​