Answer:
I think this is slope. So for each point you go up 3 units. All of the point should connect into a straight line.
Explanation:
Mark Point R on the graph to its coordniates. Do the same to Point D, L and F. after you are done then go back to each point and go up 3 units/points. Then draw a line connecting the 4 points. Then you will have your answer. Hope this helped!