Question

If x>0 and y>0 and x^9 = 4 and x^7 = 9/y^2, which of the following is an expression for the value of x in terms of y?
A) 4y/9 B) 2y/3 C) 3y^2/2 D) 6y or E) 36y^2 ?

Answer 1

x^9 / x^7 = x^2 = 4 / 9/y^2
x^2 = 4y^2 / 9
x = 2y / 3

answer is B

Answer 2

thanx