If xy=9, x/y=36, for positive numbers x and y, y=?  Answers:  A) 1 / 2  B) 2  C) 1 / 3  D) 3  E) 1 / 6

Rationale: very easy question . 2 variables and 2 easy equations . xy = 9 - - - > x = 9 / y - ( i ) x / y = 36 - - - > replacing ( i ) here - - - > 9 / ( y ^ 2 ) = 36 - - - > y ^ 2 = 9 / 36 = 1 / 4 - - - > y = 1 / 2 or - 1 / 2 the question states that x and y are positive integers . therefore , y = 1 / 2 is the answer . answer a .
Answer: A