Now you might say, well, why don't I just add up all the residuals and try to minimize that? But that gets tricky because some are positive and some are negative. And so a big negative residual, negative residual could counterbalance a big positive residual and it would look, they would add up to zero and then it would look like there's no residual. 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.