i need help with 2 and 3

2. For a consumer whose preferences are represented by the utility function u(x1, X2) = VX1 + 12 and a budget constraint PIT, + 2 = m how much income does she need to compensate for a doubling of pifrom 1 to 2. In this example p2 is always equal to 1. 3. Show that consumer demand functions are homogeneous of degree zero in incomes and prices