Which relation represents a function? a. { (0,0, (2,3), (2,5), (6,6) } b. { (3,5), (8,4), (10,11), (10,6) } c. { (-2,2), (0,2), (7,2), (11,2) } d. { (13,2), (13,3), (13,4) (13,5) }

A function will not have any repeating x values ... they all have to be different. The y's can be repeating, just not the x's.

So just look at ur x terms and find the set that has all different x terms ... no repeating ones.

answer is : C