What is a function?

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Prepare for the Maryland Comprehensive Assessment Program (MCAP) Test. Use our multiple choice questions and flashcards to understand MCAP terms deeply. Hints and explanations are available for each question to help you succeed. Start your journey to test readiness today!

Multiple Choice

What is a function?

Explanation:
A function is a rule that assigns exactly one output to every input. In other words, for any input value you pick, there must be one and only one corresponding output. If a relation could give two different outputs for the same input, or if some inputs have no output at all, it isn’t a function. A horizontal line is still a function because, for every input x on that line, you get a single output y (the same value across all x). So the defining idea is that each input has exactly one output, which is why that description is the best answer.

A function is a rule that assigns exactly one output to every input. In other words, for any input value you pick, there must be one and only one corresponding output. If a relation could give two different outputs for the same input, or if some inputs have no output at all, it isn’t a function. A horizontal line is still a function because, for every input x on that line, you get a single output y (the same value across all x). So the defining idea is that each input has exactly one output, which is why that description is the best answer.

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