6 Marginal Rate of Substitution Recall that the Marginal Rate of Substitution for two goods x and y is minus the marginal utility of good x, divided by the marginal utility of good y: ammo) _ 6:2: MRS 3mm) 3:: (a) For a consumer with utility function U (1mg) = a: + 3;, what is the marginal rate of substitution? Show your work. (b) For a consumer with utility function U (as, y) = 222% What is the marginal rate of substi- tution? Show your work