The table is
\ \
Domain \ | \
\
Range \ | \
\
| \
\
5 \ | \
\
| \
\
5 \ | \
\
| \
\
1 \ | \
\
| \
\
1 \ | \
Express the relation as ordered pairs
The domain of the relation is the set of all first (x-coordinates) coordinates.
\The domain of the relation is .
The range of the relation is the set of second (y-coordinates) coordinates.
\The range of the relation is .
This is not a function because in the domain is paired with two range values 5 and 1.
Therefore the relation is not a function.
No.