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Tool: Vertical Line Test
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Go to: http://www.shodor.org/interactivate/activities/VerticalLineTest/ (opens a new window)
Description: This activity allows users to attempt to build functions, curves that pass the vertical line test. Students roll dice to create 5 points, then they try to connect the 5 points to create a function. If it is not possible, they click on Not possible, and get feedback. If it is a function, the applet says, "Your graph passes the vertical line test." It is easy to reset and then get five new points. There are some exploration questions that can be found under "What".
Technology Type: Java Applet 
Author: Shodor: Project Interactivate
Language: English 
Cost: Does not require payment for use

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Lesson Plans: Functions and the Vertical Line Test
Graphs and Functions
Introduction to Functions
Impossible Graphs
Support Materials: Impossible Graphs Dialogue
Functions and the Vertical Line Test Dialogue
Tools: Number Cruncher
Possible or Not?
Whole Number Cruncher
Courses: Math 7 Domain & range
Algebra Vertical Line Test