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: NCERT Class 11 Mathematics, Chapter 10, Straight Lines._
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