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Function or Not a Function (1 minute)

Function: x-values do not repeat. For example: (1, 2), (3, 5), (5, 7), (8, 9) Is a function because none of the x-values repeats. Not a function: x-values repeats For example: (2, 3), (4, 5), (2, 5), (-5, 6) Is not a function because the x-value 2 repeats.