d. (12 points) Consider the utility function above= U (x, y) = 2 In x + 4 1n 3!. Let px and py be the prices of x and y and I the consumer's income. Derive expressions for the utility optimizing quantities of x and y in terms of the prices and income. (You must derive these results for full credit.) Explain why these expressions generate the utility-maximizing (as opposed to utility-minimizing) quantities of x and y