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Please help me, which of the following sets of ordered pairs is a function?

Please help me, which of the following sets of ordered pairs is a function?-example-1

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function means no x value repepetes with a differnt y value
(x,y)
first numbers never repeat


first one, the x values repeat
2nd, x values rpeat
3rd, no repeat
4th, -3 repeats

answer is 3rd option
User Seb Thiebaud
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