The Vertical Line Test

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ExplorationGRADES 6-8

Skill:

Define and distinguish between relations and functions, dependent and independent variables, and domain and range; identify whether relations are functions numerically and graphically.

The Vertical Line Test

Perform the vertical line test to determine which graphs represent functions.

Putting It All Together

Answer these open ended questions on your own or with others to form deeper math connections.

Open-ended question 1

How does the vertical line test help you identify a function?

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Open-ended question 2

Would a horizontal line test also work to identify a function? Why or why not?

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