M is going to be equal to r, 0.946, times the sample standard deviation of y, 2.160, over the sample standard deviation of x, 0.816. We can get our calculator out to calculate that. So we have 0.946 times 2.160 divided by 0.816. It gets us to 2.50. Let's just round to the nearest hundredth for simplicity here. So this is approximately equal to 2.50. And so how do we figure out the y-intercept?