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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: syllabus Mathematics, Chapter 10, Straight Lines._
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