Answer the questions below:

For the following utility functions, find the marginal utility of x: 1.) U(x, y) = 4x + 2y 2.) U(x, y) = 3xy 3.) U(x, y) = x - y 4.) U(x, y) = 5x^0.4y^0.6 5.) U(x, y) = 3x + 2y + 6xy + x^2+ y^3Use the examples from the questions above. For 1, 2, and 4, are x and y substitutes or complements? What's special about example 1? For 3, what can we say about y