So with the bottom bound of the horizontal line y is equal to e, and an upper bound with y is equal to e to the third power. So pause this video and see if you can work through it. So one way to think about it, this is just like definite integrals we've done where we're looking between the curve and the x-axis, but now it looks like things are swapped around. 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.