Which statement describes the domain of a relation?

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Study for the 8th Grade FAST Mathematics Pre-Algebra Test. Enhance your skills with interactive flashcards and multiple choice questions, each containing hints and explanations to boost your comprehension and readiness for the exam. Get ready to ace your test!

Multiple Choice

Which statement describes the domain of a relation?

Explanation:
The domain is the set of all input values that appear in a relation. Since a relation is a collection of ordered pairs (x, y), the domain comes from the x-coordinates—the first elements of each pair. So, if you have pairs like (2, 3), (4, 1), (2, 5), the x-values are 2, 4, and 2 again, and the domain is the set {2, 4} (duplicates don’t appear in a set). The corresponding set of outputs, the y-values, is called the range, which would be {3, 1, 5} in that example. The ordered pairs themselves describe the relation as a whole, not just the inputs.

The domain is the set of all input values that appear in a relation. Since a relation is a collection of ordered pairs (x, y), the domain comes from the x-coordinates—the first elements of each pair. So, if you have pairs like (2, 3), (4, 1), (2, 5), the x-values are 2, 4, and 2 again, and the domain is the set {2, 4} (duplicates don’t appear in a set). The corresponding set of outputs, the y-values, is called the range, which would be {3, 1, 5} in that example. The ordered pairs themselves describe the relation as a whole, not just the inputs.

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