In Exercises, the table of data contains input–output values for a function. Answer the following questions.

a) Is the change in the inputs, x, the same?

b) Is the change in the outputs, y, the same?

c) Is the function linear?

x 20 30 40 50 60 70 80 11.8 24.2 36.6 49.0 61.4 73.8 86.2