x varies inversely as square of y. Given that y=3 for x=1. The value of x for y = 7 will be equal to: Choose the correct option.
A) 3  B) 6  C) 1/9  D) 1/3  E) 9/49
Explanation :   Solution: Given x = k/y^2, where k is constant. Now, y=3 and x =1 gives k = 9.   .'. x = 9/y^2   =&gt; x =9 /7^2 = 9/49   Answer : 9/49
<result>E</result>
x varies inversely as square of y. Given that y=3 for x=1. The value of x for y = 7 will be equal to: