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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.

Groups:
Function, Not a Function, group_name3, group_name4,

Words:
{ (0, 0), (0, 2), (2, 0), (2, 2) }, { (2, 2), (2, 3), (3, 2), (3, 3) }, { (2, -1), (2, 1), (3, -1), (3, 1) }, web page{ (-2, -3), (-3, -2), (2, 3), (3, 2) }, {(-2,-1) , (1,-4) , (7,-10) , (8,-11)}, . { (2, 2), (3, 2), (4, 2), (5, 2) }, { (-2, 0), (0, -2), (0, 2), (2, 0) }, { (0, 0), (2, -2), (2, 2), (3, 3) }, { (2, 3), (2, 4), (2, 5), (2, 6) }, { (0, 0), (1, -1), (1, 1), (2, 2) }, { (-2, 2), (-1, -1), (-1, 1), (0, 0) }, { (-1, 0), (0, 1), (1, 0), (0, -1) }, { (-2, 2), (-1, 1), (1, 1), (2, 2) }, { (-3, 9), (-2, 4), (2, 4), (3, 9) }, { (2, -2), (0, 0), (2, 2), (3, 3) }, { (-2, 0), (1, 2), (2, 0), (0, -2) }, { (9, -3), (4, -2), (3, -2), (8, 3) },