Which relation is not a function? 1: {(2,-2), (3,-1), (4,0), (5,1), (6,2), (7,3)}
2: {(9,7), (4,1),(3,2), (7, 9), (3, -1), (5,5)}
3: {(6,2), (5,8), (4,13), (11,9), (2,8), (13,4)}
4: {(-5,4), (-3,4), (-1,4), (1,4), (3,4), (5,4)}

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