So this is 4, 3. So those are our 3 points and what we want to do is find the best fitting regression line, which we suspect is going to look something, we'll see what it looks like, but I suspect it's going to look something like that. We'll see what it actually looks like using our formulas, which we have proven. So a good place to start is just to calculate these things ahead of time and then just substitute them back into the equation. So what's the mean of our x's? The mean of our x's is going to be 1 plus, I'll do the same colors, 1 plus 2 plus 4 divided by, I'll do this in a neutral color, the mean of our x's divided by 3. And what's this going to be?