Question 17 (4 points) Suppose that the demand and supply functions for good x are given as follows: Of - 240 - 2Px + 1 - P, and Of = -30 + P -2t +s -2f where Py denotes the price of good x, P, denotes the price of a related product y, I denotes income, t denotes tax firms face, s denotes subsidy and f denotes factor prices. What is the nature of the relationship between products x and y? O and They are substitutes since since aPy O. bod They are complements since since apy O They are substitutes since since =10 aPy They are complements since aPx Previ