Question

Which of the following is a function.

Answer 1

C

Explanation:

C is correct because each input is "linked" to only one output. If one input is linked to more than one output then it is not a function. Or in answer B's case 1 is linked to both output o and 5. However, if one of the 1's were negative (such as X:-1 Y:5) and the other was positive it would be a function.

Answer 2

C

Explanation:

It is reaaly simple, just look at the x and see if it repeats

A repeated the 1

B repeats the 1

C doesn't repeat anything

D repeats the -1

Therefore, since one input can only have one output, C is the funtion