So you could just add up the absolute values. So you could say, well, let me just take the sum of all of the residual, of the absolute value of all of the residuals. And then let me change m and b for my line to minimize this. And that would be a technique of trying to create a regression line. But another way to do it, and this is actually the most typical way that you will see in statistics, is that people take the sum of the squares of the residuals, the sum of the squares. And when you square something, whether it's negative or positive, it's going to be a positive. So it takes care of that issue of negatives and positives canceling out with each other.