Question

(04.01 LC)

Which of the tables represents a function?
Table A


Input

Output

3 1
3 4
2 3

Table B


Input

Output

2 7
5 6
2 9

Table C


Input

Output

1 5
7 2
7 3

Table D


Input

Output

3 4
1 5
8 5


Table A
Table B
Table C
Table D

Answer 1

I believe the answer is table D.

Explanation:

Each input can only have one output. The other tables have multiple outputs for each input. Therefore they get "cut off," and table D is the answer.

Helper's Message:

I hope this answer helped you! I wouldn't mind if you hit the 5-star rating or gave me a thank you. :)

-ChocoChocoCho

Answer 2

Only table D is a function.  All of the others fail the "vertical line test."  The definition of a function is for each input there is only one unique output.  So for example, any given input value of x, there can only be one unique output value for y.