A direct variation equation takes the form y=kx, where k is a constant.
Choice A displays a direct variation since it takes the form y=kx, where k=5.
Choice B does NOT display direct variation because x is in the denominator. This relationship between x and y in choice B is called inverse variation.
Choice C displays direct variation since it takes the form y=kx, where k=0.7
Choice D displays direct variation since it takes the form y=kx, where k=1/9.
In conclusion, your answer is CHOICE B. Have an awesome day! :)