To find the slope of ordered pairs do (y2-y1)/(x2-x1). Your y2 is your y in your second ordered pair and your y1 is your y in the first ordered pair. Same with x. I'll do two examples. This example will be the correct answer. First example, problem B. says (0,0) and (3,2). The 2 in your second ordered pair is your y2 and your 0 in your first ordered pair is your y1. The 3 in the second pair is your x2 and your 0 in the first pair is your x1. So, (2-0)/(3-0) which is 2/3.