$\"\"$

The relation is

$\"\"$

Express the relation as ordered pairs. $\"\"$

Draw a table with two columns and list the x-coordinates in the first column and y-coordinates in the second column. \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \
\
x
\ \
y
\
\
10
\ \
1
\
\
20
\ \
3
\
\
30
\ \
2
\
\ $\"\"$

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 $\"\"$

$\"\"$

Each element of the domain is paired with exactly one element of the range.

Therefore the relation is a function.

$\"\"$

Yes.