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Two non-vertical parallel lines have slopes that are:
AUnequal ones
BOpposite ones
CReciprocal
DEqual ones
Answer & Solution
Correct answer: D. Equal ones
1. Parallel lines make the same angle with the x-axis.
2. So their inclinations are equal.
3. Equal inclinations give equal slopes.
_Source: NCERT Class 11 Mathematics, Chapter 10, Straight Lines._
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