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

The second one is a function. {(-8, -2), (7, -2),(-9,2), (0,0)

Explanation:

Its because the y-value is repeated twice.

Hope it helps.

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