Linus has the utility function U(x, y) = x + 3y. Draw the indifference curve that goes through point (3,3), and the indifference representing com- binations that gives Linus a utility of 6. a) Describe the shape of these indifference curves. b) If the price of x is 1 and the price of y is 2 and his income is 8, what bundle does Linus optimally choose? c) If the price of x is 1 and the price of y is 4 and his income is 8, what bundle does Linus optimally choose