Two functions, function a and function b, are shown below: function a x y 7 21 8 24 9 27 function b the first quadrant of a coordinate grid is shown from 0 to positive 10 on both axes at intervals of 1. the title is function b. only the even numbers are shown on the scale. a line is drawn by connecting the points on ordered pairs 2, 4 and 3, 6 and 4, 8. which statement best compares the rate of change of the two functions?