Which set of ordered pairs represents a function? {(0, 1), (1, 3), (1, 5) (2, 6)}

{(0, 0), (1, 2), (2, 4), (3, 4)}

{(0, 1), (1, 2), (2, 3), (2, 4)}

{(0, 0), (0, 2), (2, 2), (2, 4)}

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.