Graph the relation. Is the relation a function? Why or why not?
{(–1, 9), (0, –1), (–1, 4), (4, 9)}
No; a range value has two domain values.
No; a domain value has two range values.
Yes; there is only one range value for each domain value.
Yes; there is only one domain value for each range value.
The relation is not a function because the domain value -1 is associated with two different range values (9 and 4), violating the definition of a function where each domain value can only be associated with one range value.
Below is the graph of the relation:
(4, 9) x
(1, 4) x
(0, -1) x
(-1, 9) o
(-1, 4) o
The x's represent the two different range values for the same domain value, indicating that it is not a function.