1Cademy - Example: Finding the Domain and Range of the Relation $$\{(1,3), (2,6), (3,9), (4,12), (5,15)\}$$

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Finding the Domain and Range from a Set of Ordered Pairs

Example

Example: Finding the Domain and Range of the Relation $\{(1,3), (2,6), (3,9), (4,12), (5,15)\}$

For the relation given by the set $\{(1,3), (2,6), (3,9), (4,12), (5,15)\}$ , the domain is identified by listing the first elements of each ordered pair. Since the $x$ -values are $1$ , $2$ , $3$ , $4$ , and $5$ , the domain is $\{1, 2, 3, 4, 5\}$ . The range is found by listing the second elements. The corresponding $y$ -values are $3$ , $6$ , $9$ , $12$ , and $15$ , so the range is $\{3, 6, 9, 12, 15\}$ .

Updated 2026-05-03

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OpenStax Intermediate Algebra

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