Answer:
Step-by-step explanation: Take 2 sets of points. I used (2,12) and (4,9). We are going to use the formula of Y2-Y1 / X2-X1 with those points.
12-9 over 2-4. That will give you 3/-2 for slope. Try a second set of points to verify I used (10,0) and (8,3) gives you 3-0 and 8-10 which results in 3/-2.