algebra 1
posted by sydney
I need to find the slope of a line that is parallel to the xaxis, completely perpendicular. The answer choices are
A. 0
B. 1
C. undefined
D. infinity
I'm thinking undefined?

Reiny
And I am thinking: Confusing and contradictory.
If parallel to the xaxis, 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. 
sydney
The line is straight up & down

sydney
Okay, I meant parallel to the yaxis, so sorry

sydney
So is the answer C?

Anon
A vertical line has a slope of 0

Reiny
NOOO!
A vertical line has an undefined slope.
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