Answer:
15. It is a function
16. It is a function
Mapping diagram is attached for reference.
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.