Is it a function? Coordinates, Tables, Mappings

x and y values cannot repeat

x values cannot repeat

y values cannot repeat

x and y values can repeat

{(1,2), (1,3), (1,4), (1,5)}

{(1,2), (2,3), (3,4), (4,5)}

{(1,2), (3,4), (3,5), (6,7)}

{(1,2), (3,4), (5,6), (5,8)}

{(5,9), (9,11), (7,3), (5,-2)}

{(-6,2), (-5,3), (-6,1), (-5,4)}

{(-4,2), (-4,3), (-4,4), (-4,5)}

{(1,8), (2,8), (3,8), (4,8)}

Table A

Table B

Both Tables A & B represent functions

Neither table represents a function

Mapping A

Mapping B

Both Mapping A and Mapping B represent functions

Neither Mapping represents a function

y-value.... two x-values

x-value.... two y-values

y-value.... one x-value

x-value.... one y-value

-3

-5

6

0

3

6

2

Any value of m would make this a function.