determine which set of ordered pairs is a function.
a.{(-1,3),(1,4),(-1,5)}
b. {(5,3),(-6,3),(-2,4)}
c. {(0.5, 1.6),(1, 1.75),(1.5, 2.3), (0.5, 3.6)}
d. {(1,2), (-5,4),(3,6),(-5,2)}

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Ok do any of your sets include 2 or more points with the same x but with different y?

For the first one:
Do any of your points have same x but different y?

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