Which of the tables represents a function?

Table A
Input Output
8 −9
8 −8
10 −8
Table B
Input Output
4 11
7 12
7 13
Table C
Input Output
−4 0
−3 3
−2 5
Table D
Input Output
10 0
10 4
3 7

Table A
Table B
Table C
Table D

Question

Which of the tables represents a function?


Table A
Input	Output
8	−9
8	−8
10	−8
Table B
Input	Output
4	11
7	12
7	13
Table C
Input	Output
−4	0
−3	3
−2	5
Table D
Input	Output
10	0
10	4
3	7








 Table A
 Table B
 Table C
 Table D

evoker · Answer

Each x must have one and only one y  for it to be a function

triciaal · Answer

still have a question?

triciaal · Answer

a function exists when there is only one output value for a chosen x-value

triciaal · Answer

vertical line test
plot the points  
pick an x-value if it has more than 1 y-value it is not a function

triciaal · Answer

EXAMPLES
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