Question

The domain of a relation is

Answer 1

The domain is the set of all first elements of ordered pairs (x-coordinates).

Answer 2

Answer with explanation:

The relation is a set of ordered pair of the type:

                                   (x,y)

• where the first element of the ordered pair i.e. the value of x represent the domain of the relation.

• and the second element of the ordered pair i.e. the value of y represent the range of the relation.

( For a function we define domain as a set of all the x-values for which  a function is defined)