Forging Connections
Identify Functions
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1 Warmup

Using this sketch, you’ll distinguish independent and dependent variables.


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Hint Videos:    

Which points can you drag?

What do you notice, and what do you wonder?

2 Examples and Non-Examples

Using this sketch, you’ll learn to distinguish a function from a relation that is not a function.


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3 Accomplishments

By the end of this lesson, you accomplished several goals:

  • Vary variables. You dragged independent points and observed and described the behavior of dependent point(s).
  • Distinguish independent and dependent variables. You learned how to tell the difference between independent and dependent variables.
  • Distinguish functions and non-functions. You used the drag test to tell the difference between functions and non-functions.
  • Define “function.” You formulated and discussed your own definition of function.
  • Apply your definition. You used your definition to categorize relations as functions or not functions.
  • Use the term “relation.” You became familiar with the term relation to describe variables with a relationship that may or may not be a function.

3 The Fine Print


These activities require web access using a browser that supports HTML5 and JavaScript. (That means almost any current browser.) No purchase is required, and there’s no advertising anywhere.

Release Information

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Update History:

25 Aug 2020: Changed worksheet download to .docx instead of .pdf, making it easy for teachers to provide google docs to students
23 Apr 2020: Added Reset buttons, Accomplishments section, & Download links for Worksheet & E/E Tickets
03 Apr 2018: Added a sketch page, revised worksheet, and revised objectives.
21 Oct 2017: Migrated to FC site.
18 Oct 2015: Created this page.