One step better than that is to actually, based on the work we did in the last video, we can just subtract this bottom equation from this top equation. So let me subtract it, or let's add the negative. So if I make this negative, this is negative, this is negative, what do we get? We get m times the mean of the x's minus the mean of the x squareds over the mean of x, over the mean of the x's. The plus b and the negative b cancel out, is equal to the mean of the y's minus the mean of the x y's over the mean of the x's. And then we can divide both sides of the equation by this. And so we get m is equal to the mean of the y's minus the mean of the x y's over the mean of the x's over this.