Question
Which set of ordered pairs does not represent a function?

 

{(8,−9),(7,−3),(6,−9),(9,7)}{(8,−9),(7,−3),(6,−9),(9,7)}
{(−4,5),(1,0),(1,−3),(8,3)}{(−4,5),(1,0),(1,−3),(8,3)}
{(−7,5),(5,5),(−3,9),(0,−3)}{(−7,5),(5,5),(−3,9),(0,−3)}
{(5,−2),(1,−7),(−3,−3),(−4,−2)}{(5,−2),(1,−7),(−3,−3),(−4,−2)}

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