Consider a homeothermic utility function U(x,y) and the budget constraint is px*x+py*y=I

Prove that partial x/partial I is a constant.

MRS = F( ) Consider a homothetic utility function UCKy) and the budget constraint P x x + pyy = I ( a ) Prove that neither X nor y is a Giffen good ( b ) Prove that or is a constant ( a) y X x and y are norma good 4 not giffen good