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Why is the line x=4 a vertical line?

  • Algebra -


    The equation x=4 refers to all ordered pairs whose x value is 4. Thus, for example, (4,o), (4,1), (4,2), etc. all satisfy the given equation. Notice that the three ordered pairs above fall on the vertical line passing through 4 on the x-axis. Indeed, all ordered pairs on such vertical line have x coordinate =4.


    Rich B.

  • Algebra -

    Thanks a million!

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