What is a function? Teachers have been asking pupils this question from the time they started their algebra careers. A helpful video walks through the process of using the vertical line test to determine a function while showing various graphical examples. 

Concepts

vertical line test, functions

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Additional Tags

math

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Instructional Ideas

• Use the video as an opening activity and then present problems for students to complete as a way to check for understanding
• Assign the video as homework and check for understanding the next day

Classroom Considerations

• Requires Internet access to watch or show the YouTube video
• The second in a series of 29 lessons related to functions

• This video is hosted on YouTube

Pros

• Visuals and different colors allow the learner to see the difference between a graph that is a function and one that is not
• Uses vocabulary and notation throughout the lesson

Cons

• None

Common Core

HSF-IF.A.1