Answer all parts please :)

1. (3 points) Which of the following must be true at equilibrium for the following utility function U = 4X3Y? (a) I - Px * X | Py * Y and MR.Sx,Y = Px PY (b) U - Px * X | Py * Y and MRSx,Y - PX Py (c) 1 = Px * X \\ Py * Y and MRSXY - Py PY (d) MUx - MUy and MRSXY Py PX 2. (3 points) Suppose there exist some equilibrium quantities of X and Y that an individual consumes. If the price of X increases (a) the individual will consume less X. Total utility will stay the same. (b) the individual will consume more X but less Y to compensate. Total utility will decrease. (e) the individual will consume less X and more Y to compensate. Total utility will increase. (d) the individual will consume less X. Total utility will decrease. 3. (3 points) A corner solution of X' - 0 can occur when MUX MUY (a) Px PY MUX MUy (b)- SPY (C) MUX > MUY and Px > Py (d) MUx > MUy and PX