Now what makes this an interesting thing in nonlinear is that it's constantly changing. The steepness, it's very low here, and it gets steeper and steeper and steeper as we move to the right for larger and larger x values. But if we look at the point in question, when x is equal to five, remember, f prime of five would be, if we were estimating it, this would be the slope of this line here. And the slope of this line, it looks like for every time we move one in the x direction, we're moving two in the y direction. Delta y is equal to two when delta x is equal to one. So our change in y with respect to x, at least for this tangent line here, which would represent our change in y with respect to x right at that point, is going to be equal to two over one, or two. And they told us to estimate it, but all of these are way off.