So we know the slope right over here is a slope of negative eight. We know a point on that line, it contains the point one comma negative nine, so we could use that information to find the equation of the line. The line, just to remind ourselves, has the form y is equal to mx plus b, where m is the slope, so we know that y is going to be equal to negative 8x plus b and now we can substitute the x and y value that we know sits on that line to solve for b. So we know that y is equal to negative nine, let me just write this here, y is equal to negative nine when x is equal to one. And so we get negative nine is equal to negative eight times one, so negative eight plus b. Well, let's see, we could add eight to both sides and we get negative one is equal to b. So we're done.