And the way we did it, we said, OK, well, let's find the slope between that point and then another point that's not too far away from that point. And we got the slope of the secant line. And it looks all fancy, but this is just the y value of the point that's not too far away. And this is just the y value of the point in question. So this is just your change in y. And then you divide that by your change in x. So in the example we did, h was the difference between our two x values.