Derek’s utility function is u(x, y) = 19x + 19y. 

a. Below, graph some of his indifference curves. Include enough to give a good feel for the whole map. 

b. In the lower panel, carefully draw Derek’s demand curve for X when his income is $3060 and the price of Y is $34. Label this demand curve “–b–”. 

c. In the lower panel, carefully draw Derek’s demand curve for X when his income is $3060 and the price of Y is $24. Label this demand curve “–c–”.