X 2 3 y 4 xy 1 2 July 8, 2019 16 32 64 128 X 1 3 y 2 4 2 xy )/ 5 3 x y 2 xy 2 9 x y 4 xy 1 √ x 2 3 √ y 4 √ xy 1 2 3 x y 2 xy 2 9 x y 4 xy 1 by elimination method X 2y xy '+( x 2 1 4 y x 3 2 X - y = 3