Answer:
Table 3!
Explanation:
In order for a set of numbers to be a function the x coordinate can not repeat!
Table one: In table one if you look at the x coordinate you will see that the numbers 2 and 4 both repeat
Table two: In this table the number 0 repeats more than once in your x- coordinate spot
Table three: There are no repeating x coordinate values so this is your answer!
Table four: Once again the number 0 repeats in your x coordinates