Question 428031
it's a relation.


in order for it to be a function there can only be 1 output for each and every input.


only one instance of multiple outputs for an input makes it a relation.


your dataset provides the following mapping:

<pre>
      input  output
        1       3
        1      -3
        2       4
        3       4
</pre>


the 2 mapping to 4 and the 3 mapping to 4 are ok for a function because there is only one output for each of the inputs.


the 1 mapping to 3 and -3 is what causes this to be a relation rather than a function because you have more than 1 output for the same input.