This Question: 5 pts 21 of 25 (20 complete) is Quiz: 114 pts p... Suppose that x and y represent the amounts of two basic inputs for a production process and that the equation 45x y = 8254 describes all input amounts where the output of the process is 8254 units. a) Find dy dx b) What is the marginal rate of substitution of x for y when x = 625 and y = 135? dy a dx b) The marginal rate of substitution of x for y when x = 625 and y = 135 is (Simplify your answer.)