Question

Which of the tables represents a function?

Table A
Input Output
5 3
5 2
4 1

Table B
Input Output
1 2
3 2
5 3

Table C
Input Output
0 0
1 2
1 3

Table D
Input Output
4 2
4 3
4 4

Answer 1

Input is domain and output is co-domain.
An expression is said to be a function if for every input, there is only one output. In table B, for every input, you get different outputs. Therefore, table B is a function.

Answer 2

table B is correct I do FLVS and just did the test and got that correct.