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Which set of ordered pairs represents a function?

{(2,9),(5,9),(1,−6),(−5,5)}

\{(6, 6), (6, 8), (-8, -7), (-3, -8)\}{(6,6),(6,8),(−8,−7),(−3,−8)}

\{(1, 8), (9, -3), (7, -4), (7, -6)\}{(1,8),(9,−3),(7,−4),(7,−6)}

\{(-5, -1), (-3, -7), (-5, 3), (-7, -4)\}{(−5,−1),(−3,−7),(−5,3),(−7,−4)}

 May 27, 2021
 #1
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FIrst one  ....   no values of x have two values of y     YES

 

Second one  6.6   and 6,8   means the value of x = 6 has two values for y    NO

Third one      7,-4     7, -6                                                                                   NO

Fouth one     -5,1    -5,3       no

 May 27, 2021

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