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Which of the following relations is a function? {(5, –7), (4, 6), (–3, 8), (5, 9)} {(8, –4), (–4, 8), (–4, –8), (–8, 4)} {(2, 3), (–2, 3), (3, 2), (–3, –2)} {(9, –1), (–1, 9), (9, 2), (2, –1)}
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Which of the following relations is a function?

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

User Kunok
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The first one IS a function. The rest are not.
User Darm
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