algebra 1

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I need to find the slope of a line that is parallel to the x-axis, completely perpendicular. The answer choices are
A. 0
B. 1
C. undefined
D. infinity

I'm thinking undefined?

  • algebra 1 -

    And I am thinking: Confusing and contradictory.

    If parallel to the x-axis, the line must be horizontal.
    Where does the "completely perpendicular" part come into play ??

    Btw, a horizontal line has a slope of zero,
    the slope of a perpendicular is undefined.

  • algebra 1 -

    The line is straight up & down

  • algebra 1 -

    Okay, I meant parallel to the y-axis, so sorry

  • algebra 1 -

    So is the answer C?

  • algebra 1 -

    A vertical line has a slope of 0

  • correction - algebra 1 -

    A vertical line has an undefined slope.

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