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Which of these sets of ordered pairs represent a function

Which of these sets of ordered pairs represent a function-example-1
User Aimee
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both a and b are functions.
User Tropikalista
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both a and b are functions. for it to be a function, you can only have 1 y value per x value.

this is not a function because 1 has 2 y values
(1,3)(2,5)(1,4)(3,2)
User Brendan Nee
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