Answer:
1.) 5,0,-3, -6,-3,0,5 (use the points for the graph and connect them together)
2.a) (0,9) He is starting at the heighest point of the ramp, its the height of where he starts walking.
b.) (10,4) The point where they both are at the same height, at the same time.
c.) (18,0) This is when he reaches to ground level or to 0 feet after a certain amount of time, 18 seconds.