If Jose Maria's utility function is what is his marginal utility of good y? U(x, y)=x+Axy+y. Jose Maria's marginal utility of good y (MU) is MUy = BAxy-1+1. (Properly format your expression using the tools in the palette. Hover over tools to see keyboard shortcuts. E.g., a superscript can be created with the ^ character.) What is his marginal rate of substitution between these two goods? Jose Maria's marginal rate of substitution (MRS) of good x for good y is MRS = (Properly format your expression using the tools in the palette.)