Does anyone know how to find the slope between two points without graph paper, such as: (0,-1) and the point (3,5). In one part of my book it says subtract the ordinates from each other and the abiscas from each other (i.e. : -1-5=-6 and 0-3=-3, subtracting the second point, from the first point.) But then it says subtract the first point from the second point. Which is the right way?