If xy=9, x/y=36, for positive numbers x and y, y=? Select.
A) 1/2  B) 2  C) 1/3  D) 3  E) 1/6
Very easy question. 2 variables and 2 easy equations.   xy=9 ---&gt; x=9/y - (i)   x/y=36 ---&gt; replacing (i) here ---&gt; 9/(y^2)=36 ---&gt; y^2=9/36=1/4 ---&gt; y=1/2 or -1/2   The question states that x and y are positive integers. Therefore, y=1/2 is the answer.   1/2nswer 1/2.
<result>A</result>
If xy=9, x/y=36, for positive numbers x and y, y=?