Question

the variables x and y vary inversely. which equation relates x and y when x=9 and y=3

Answer 1

Since x & y vary inversely  (it means when x increases, y decreases & vice versa)
Then the equation==> y = k/x (k is a constant to be calculated)

But x=9 and y=3 (given) ==> 3=k/9 or k=27 & the equation becomes y=27/x