Question

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

keeping in mind that a function does not have any X-Repeats, that is, the 1st coordinate in every pair never repeats, Check the picture below.