let's say we try, X is 1/3, if X is 1/3 then Y is going to be negative 3 times 1/3, is negative 1 so to go from 1 to 1/3, we divide by 3 to go from negative 3 to negative 1, we also divide by 3 we also scale down by a factor of 3 so whatever direction you scale X in you are going to have the same scaling direction as Y that's what it means to vary directly now it's not laways so clear sometimes it would be ofuscated so you could write, so let's take this example right over here