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Common Core for Grade 8
Common Core for Mathematics
More Math Lessons for Grade 8

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Examples, solutions, videos, and lessons to help Grade 8 students understand that a function is a rule that assigns to each input exactly one output. The graph of a function is the set of ordered pairs consisting of an input and the corresponding output.

Common Core: 8.F.1

Suggested Learning Targets

  • I can determine if an equation represents a function.
  • I can apply a function rule for any input that produces exactly one output.
  • I can generate a set of ordered pairs from a function and graph the function.

The following table shows how to identify functions using graphs, tables and sets. Scroll down the page for more examples and solutions.
Identify Functions

Understanding functions (Common Core Standard 8.F.1)

Identifying Functions (8.F.1)

8.F.1 - Introduction to Functions
A function is a pairing of each number in a given set with exactly one number in another set.
A domain is the set of all numbers that you put into the function (input). x-coordinates.
A range is the set of all numbers that come out of the function (output). y-coordinates.

What is a function?

CCSS 8.F.1 - Understanding Functions

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
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