Which relation is a function?

A.
(–25, 16), (0, 16), (–25, 18)

B.
(19, 11), (34, 12), (34, 10)

C.
(35, 31), (24, 15), (12, 0)

D.
(34, 30), (18, 17), (34, 15)

Question

Which relation is a function?	

A.
(–25, 16), (0, 16), (–25, 18)

B.
(19, 11), (34, 12), (34, 10)

C.
(35, 31), (24, 15), (12, 0)

D.
(34, 30), (18, 17), (34, 15)

triciaal · Answer

a relation is a function when for a given value of x there is only one value for y

triciaal · Answer

do you see C?

anonymous · Answer

Yes?

triciaal · Answer

why the question mark?

anonymous · Answer

Lol because Im not sure what you meant by the question

triciaal · Answer

really? read it again then ask your question

anonymous · Answer

What about answer choice C...

triciaal · Answer

do you see why the answer is choice C ? 
"do you see C?"

anonymous · Answer

lol no I do not see why the answer choice is C

triciaal · Answer

read the definition of a relation  given in the first reply
  and go through the options to see what does not fit the criteria

triciaal · Answer

A is not a function because when x = -25 there are 2 different values for y  16 and 18

anonymous · Answer

Ohh okay I think I understand thank you

triciaal · Answer

not B   2 values when x = 34
not D  2 values when x = 34 

you are welcome