All we know is that it needs to go through those points because they've just sampled the function at those points. But let's just, for the sake of this exercise, let's assume the simplest, let's say it's a nice, smooth curve without too many twists and turns that goes through these points just like that. So what they're asking, okay, when x is equal to four, if this yellow curve were the actual curve, then what is the slope of the tangent line at that point? So we would be visualizing that. Now to be clear, this tangent line that I just drew, this would be for this version of our function that I did connecting these points. That does not have to be the actual function. We know that the actual function has to go through those points.