Using the equation y = mx + b, find the m (slope) from the graph and the b (y-intercept from the graph). The slope, m, is the rise over the run from point A to point B. The rise is -5 and the run is 5. = -1. The y-intercept, b, is the point the graph passes through the y-axis. The b is -2 so y = -x+-2.
