Question

Is the graph a function?

Answer 1

no

Explanation:

For a relation to be a function each input must have only one output.

If you look at the points (-4,-1) and (-4,-3) you can see that The input (-4) has more than one output (-1 and -3), so it is not a function.

Answer 2

No
explanation: functions must have all x values be nonrepeating but a circle has multiple sets of repeating x-values