Observe the graph:

The set of ordered pairs are and .

Domain:

The domain of the relation is the set of all first (-coordinates) coordinates.

The domain of the relation is .

Range:

The range of the relation is the set of second (-coordinates) coordinates..

The range of the relation is .

Function:

No;

Because each element of the domain is not paired with one element of the range. \ \

in domain is paired to as well as in the range. \ \

One-to-one function:

No;

Each element of the domain is not paired with exactly one element of the range.

in domain is paired to as well as in the range.

Onto:

Yes;

Because each element of the range corresponds to an element of the domain.

Therefore, the relation is not a function.

No; the relation is not a function.