We now care about the y-axis. So let's just rewrite our function here, and let's rewrite it in terms of x. So if y is equal to 15 over x, that means if we multiply both sides by x, xy is equal to 15, and if we divide both sides by y, we get x is equal to 15 over y. These right over here are all going to be equivalent. Now how does this right over here help you? Well, think about the area, think about estimating the area as a bunch of little rectangles here. So that's one rectangle, and then another rectangle right over there, and then another rectangle right over there.