Suppose that y varies inversely with x. use the information to find k, and then choose the equation of variation. "x = 28" when y = 2.

Given that y varies inversely with x, then:
y=k/x
where
k is the constant of proportionality:
k=yx
hence, given that x=28 when y=2, then the value of k will be:
k=28×2
k=56

k=56