Which relation below represents a function? 1) {(1,5),(2,6), (3,6), (2,7)}
2) {(4,7),(2,1),(-3,6).(-3,4)}
3) {(-1,6),(1,3), (2,5),(1,7)}
4) {(-1,2).(0,5),(5,0),(2, -1)}

4.

Step-by-step explanation:

To find a function none of the x-values can be the same. For example, #1 isn't a function because 2 of the x values re 2 meaning it is not a function. #4 is a function because all of the x values are different numbers.

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