WEBThe formula to calculate slope is given as, m = (y 2 - y 1)/(x 2 - x 1) = Δy/Δx. where, m is the slope of the line, x 1, x 2 are the coordinates of the x-axis, and y 1, y 2 are the coordinates of the y-axis. Derivation of Slope Formula. The x and y coordinates of the line are used to calculate the slope of the line. The net change in y ...