You don't even have to think, you just have to substitute these with n's now. We could actually look at this, but it's going to be the exact same thing. mxn minus 2ynb plus m squared xn squared plus 2mxnb plus b squared. So once again, this is just the squared error of that line with n points, between those n points and the line y equals mx plus b. So let's see if we can simplify this somehow. And to do that, what I'm going to do is I'm going to kind of try to add up a bunch of these terms here. So if I were to add up all of these terms right here, if I were to add up this column right over there, what do I get?