Pls help me ill mark u brainliest and show ur work

Function A; 14 meters per second

Step-by-step explanation:

For function A, we choose two points to find the slope, which is the speed.

10, 140  and 20,280

slope = m = speed = y2-y1 / x2-x1

                               = (280 - 140) / (20-10)

                               = 140 / 10

                               = 14

The slope of function b is 13, because y=mx+b, where m is the slope.

14>13

so function a> function b