Answer:
15. It is a function
16. It is a function
Mapping diagram is attached for reference.
Step-by-step explanation:
Mapping diagram is a set of two parallel columns.
The first column includes the 'domain'.
And the second column includes the 'range'.
A relation is a function,
if every domain () has only one range ()
The given coordinates in the set form are in the form ()
15. We observe that each '' is attached to only one ''
Therefore this relation is a function.
16. We observe that here also each '' is attached to only one ''
Therefore this relation is also a function.