Consider the utility function u(x1, x2) = x1x2.
(a) Graph the indifference curves for utility levels 1 and 2. (They are symmetric hyperbolas Asymptotic to both axes).
(b) Graph the locus of points for which the MRS of good 2 for good 1 is equal to 1, and the locus of points for which the MRS is equal to 2.