Question

Which set of ordered pairs represents a function?

O {(2,0), (1, -4), (1,9), (-7 ,7)}
O {(-6,2), (4,2), (7,-9), (8,9)}
{(7,1),(9,5), (–3, -5),(9,6)}
{(6,-5), (5,-2), (-5,5), (-5, -1)}
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Answer 1

None of them represents a function.