Which of the following relations is not a function?

A.
(9, 4), (-4, 2), (3, 1), (-7, 2)
B.
(-7, 4), (3, 3), (-4, 1), (9, 2)
C.
(3, 4), (-4, 2), (3, 1), (-7, 2)
D.
(-4, 4), (3, 2), (9, 1), (-7,5)

Question

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

readergirl12 · Answer

@texaschic101

texaschic101 · Answer

a function will not have repeating x values, they can have repeating y values, just not the x ones.
So the one that is NOT a function, will have repeating x values.
All your points are set up like (x,y).....which sets of points have more then one x that is the same ?

readergirl12 · Answer

C..

texaschic101 · Answer

yes...that is not a function...you are correct