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Slope is not defined for a line that is:

AHorizontal
BSlanting
CShortened
DVertical
Answer & Solution
Correct answer: D. Vertical
1. A vertical line has an inclination of ninety degrees. 2. The tangent of that angle is not finite. 3. So slope is not defined for a vertical line. _Source: syllabus Mathematics, Chapter 10, Straight Lines._
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