What is the best definition of the domain of relation

Domain is the set of all possible input for which the relation is defined.

Step-by-step explanation:

If a relation is defined as

In this relation x is the variable that defines all inputs of the relation and y is the variable that defines all outputs of the relation.

Domain is the set of all possible input for which the relation is defined. So, the domain of the above relation is

In the ordered pairs, the set of x-coordinates is called domain of the relation.

-14 is the answer

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