You can either take any 2 points on the graph and plug in the values for this equation: y2-y1 / x2-x1 where y2 is the value of y for the second point, x1 is the x value of the first point and so on. Or you can find the distance from any 2 points on the line by putting the amount gone up over the amount horizontally. For example from (0, -3) to (3, 0) we go up 3 units and to the right 3 units. Remember to put the amount gone up/down over the amount gone left/right. 3/3 is the slope and 3/3 is equal to 1.
