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How to find the domain of a set

 The domain of a function is the set of all possible input values, which produce a valid output from a particular function. It is the set of all real numbers for which a function is mathematically defined.

Consider the following relation :
{(2, –3), (4, 6), (3, –1), (6, 6), (2, 3)}

The above list of points, being a relationship between certain x's and certain y's, is a relation. The domain is all the x-values, and the range is all the y-values.
domain = {2, 3, 4, 6}


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