Hello
I am currently working on this exact same question .. Have you gotten anywhere with it yet?
help please..
Consider the utility function U(x, y) = xy + y.
(a) Use the total differential to find the marginal rate of substitution (MRS) between y and x.
(b) Use the MRS to show that the indifference curves are strictly convex to the origin (i.e.
show that the MRS is diminishing).