Well, I'll just, well, let's say the vertical dimension is alpha and the horizontal dimension is beta. We know that the area, we know that the area is going to be alpha times beta. Now, if I scale up the vertical dimension by c, so instead of alpha, this is c times alpha, and this is the width is beta. If I scale up the vertical dimension by c, so this is, I have essentially, this is now c times alpha, what's the area going to be? Well, it's going to be c alpha times beta. Or another way to think of it, I have just taken, when I scale one of the dimensions by c, I take my old area and I scale up my old area by c. And that's what we're doing. We're scaling up the vertical dimension by c. When you multiply c times f of x, f of x is giving us the vertical height.