Find the rate of change: Mike can bike 3 miles in an hour. What is the speed at which mike can bike?

Rate of change = change in y divided by change in x

y = 3,6,9

x = 1,2,3

The numbers chosen above are because if mike travels 3 miles in one hours then he can travel 6 miles in two hours and 9 miles in 3 hours.

Change in y = 3

Change in x = 1

3 / 1 = 3

So, the rate of change is 3.