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3 votes
Which relation is a function?

{0, –9, –2, –3}
{(0, –9), (–9, –2), (0, –3)}
{(0, –9), (–2, –3), (–2, 0), (–3, –2)}
{(0, –9), (–9, 0), (–3, –3)}

User Mevr
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2 Answers

5 votes
The last option is a function as no x-values repeat!
User Zmogas
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7 votes
Last on - I think
{0,-9), (-9,0), (-3,-3)}
User Joe Bane
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