The dot plot shows predictions for the winning time in the 200-meter sprint. The winner finished the race in 22.4 seconds What is the greatest percent error among the predictions?

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.