I can apply those formulas to every row now. And notice what it did when I did that. Now all of a sudden, this is the y value that my line would predict, it's now using this x value and sticking it over here. It's now figuring out the squared distance from the line using what the line would predict and using the y value, this one. And then it does the same thing over here. It figures out the squared distance of this y value from the mean. So what is the total squared error with the line?