Which set of ordered pairs represents a function? O{(-4,9),(-5, 4), (-5,-2), (1, -6)}
O {(2,6), (5,1), (9, 4), (2, -6)}
O{(-7,-8), (0,1),(-3,9), (-4,-8)}
O{(-6,-5),(-3,-4), (6,6), (-3,8)}

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