The second derivative of y with respect to x, well that's going to be zero. The second derivative of a linear function, well it's going to be zero, we see that here. So this is all of the information that we have. We get this from the previous parts of the problem and we get this just taking the first and second derivatives of y equals mx plus b. So given this, can we figure out, can we figure out what m and b are? Alright, so we could, if we said m is equal to two x minus y, that doesn't seem right. This one is a tricky one.