alleryStart learning →A relation is the set of pairs (2, 10), (3, 10), (4, 20) and (5, 30). What is its domain?
AThe set 10, 10, 20, 30
BThe set 2, 10, 3, 30
CThe set 2, 3, 4, 5
DThe set 4, 5, 20, 30
Answer & Solution
Correct answer: C. The set 2, 3, 4, 5
1. The domain of a relation collects its input values.
2. The input value is the first coordinate in each ordered pair.
3. Reading off the first coordinates gives 2, 3, 4 and 5, so that set is the domain.
4. The second coordinates form the range instead.
_Source: OpenStax College Algebra (CC BY 4.0), section 3.2 Domain and Range_
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