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Algebra 21 Online
OpenStudy (anonymous):

Which relation is a function? {(-1, 1), (1, -2), (1, -3), (2, 0), (1, 5)} {(1, -1), (4, -2), (4, -3), (4, 0), (5, 0)} {(1, -1), (2, -2), (3, -3), (4, 0), (5, 0)} {(-1, 1), (-2, 2), (-3, 3), (0, 4), (0, 5)}

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