Question

PLEASE HELP QUICKLY 20 POINTS

Which of the following relations is not a function?
A. (9,4),(-2,2),(4,1),(-7,2)
B.(-7,4),(4,3),(-2,1),(9,2)
C.(4,4),(-2,2),(4,1),(-7,2)
D.(-2,4),(4,2),(9,1),(-7,5)

Answer 1

The correct answer is c, because it repeats the x value 4 twice in the series of coordinates.

Hope this helps!