Part a: (10, 120); (5, 160); (20, 40).
Part b: The ordered pair I will choose is (20, 40). These value of x means that Trish has been running for 20 seconds, and the value of y means that Trish has 40 meters left to run.
Part c: I will use (10, 120).
8x + y = 200
8(10) + 120 = 200
80 + 120 = 200