Question

Which two points on a linear graph showing time and distance would indicate a rate of change of 80 km per hour?
A. (4, 400) and (6, 480)
B. (4, 480) and (6, 600)
C. (4, 320) and (6, 480)
D. (5, 400) and (6, 560)

Answer 1

C.

Slope = (change in distance)/(change in time). For (4, 320) to (6, 480): (480 − 320)/(6 − 4) = 160/2 = 80 km/h.