So let's just get to the punch line. Let's solve for the optimal m and b. And just based on what we did in the last videos, there's two ways to do that. We actually now know two points that lie on that line, so we can literally find the slope of that line and then the y-intercept, the b there. Or we could just say it's a solution to this system of equations, and they're actually mathematically equivalent. So let's solve for m first. And if we want to solve for m, we want to cancel out the b.