We could try to find a general function that gives us the slope of the tangent line at any point. So let's say we have some arbitrary point. Let me define some arbitrary point x right over here. Then this would be the point x comma f of x. And then we could take some x plus h. So let's say that this right over here is the point x plus h. And so this point would be x plus h f of x plus h. We can find the slope of the secant line that goes between these two points. So that would be your change in your vertical. Which would be f of x plus h minus f of x over the change in the horizontal.