When y is 4, p is 0.5, and m is 2, x is 2. if x varies directly with the product of p and m and inversely with y, which equation models the situation? x p m y = 8 startfraction x y over p m endfraction = 8 startfraction x p m over y endfraction = 0.5 startfraction x over p m y endfraction = 0.5