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What makes a relation a function?
AEach output gives one input
BEach input is a whole number
CEach output is a whole number
DEach input gives one output
Answer & Solution
Correct answer: D. Each input gives one output
1. A relation is any set of ordered pairs, with inputs first and outputs second.
2. It counts as a function when every possible input leads to exactly one output value.
3. If a single input were paired with two different outputs, the relation would fail the test.
_Source: OpenStax College Algebra (CC BY 4.0), section 3.1 Functions and Function Notation_