algebra 1

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?

  1. 0
  2. 1
asked by sydney
  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.

    1. 0
    posted by Reiny
  2. The line is straight up & down

    1. 0
    posted by sydney
  3. Okay, I meant parallel to the y-axis, so sorry

    1. 0
    posted by sydney
  4. So is the answer C?

    1. 0
    posted by sydney
  5. A vertical line has a slope of 0

    1. 0
    posted by Anon
  6. NOOO!
    A vertical line has an undefined slope.

    1. 0
    posted by Reiny

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