alleryTwo lines are perpendicular when the product of their slopes is:
AEqual two
BMinus one
CPlus one
DEqual zero
Answer & Solution
Correct answer: B. Minus one
1. Perpendicular lines meet at a right angle.
2. That condition can be written in terms of the two slopes.
3. It holds exactly when their product is minus one.
_Source: syllabus Mathematics, Chapter 10, Straight Lines._
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