Which set of ordered pairs represents a function? { (2, - 2), (1, 5), (-2, 2), (1, - 3), (8, - 1) } { (3, - 1), (7, 1), (-6, - 1), (9, 1), (2, - 1) } { (6, 8), (5, 2), (-2, - 5), (1, - 3), (-2, 9) } { (-3, 1), (6, 3), (-3, 2), (-3, - 3), (1, - 1) }
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