And so what I can do is, let me set up a table actually. Let me set up a table with three columns. One for x, one for y, and then one for the derivative of y with respect to x, which this differential equation tells us in terms of x and y. And so we can look at the different points. This point right over here, when x is one and y is two, x is one, y is two. Well, the derivative, they tell us, is two times x minus y. So this is two x minus y.