And our change in y, our change in y, we go from y equals three to y equals six, so our change in y is equal to three. So our change in y over change in x is going to be three over five, which is the slope of this line, which is the derivative of the function at two, because this is the tangent line at x equals two. Let's do another one of these. So, for a function g, we are given that g of negative one equals three, and g prime of negative one is equal to negative two. What is the equation of the tangent line to the graph of g at x equals negative one? All right, so once again, I think it will be helpful to graph this. So, we have our y-axis.