So we can see here our change in x, let me do this in a new color. So our change in x here is equal to plus two, and I can draw that out. My change in x here is plus two, and my change in y is going to be, when my x increased by two, my change in y is plus, let's see, this is, if I add 10, I get to 105, and then I add another seven, so this is plus 17. So this is plus 17 right over here. Plus 17. And so my change in y over change in x, change in y over my change in x, for this secant line between when x is equaling three and x is equaling five, is going to be equal to 17 over two. 17 over two, which is equal to 8.5.