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Question 300006
JEE Mathematics · Medium

Straight Lines: Angle between lines MCQ

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Angle between linesMediumQuestion 300006

Question

If two lines have slopes m₁ = 1 and m₂ = −1, they are:
  1. A
    Perpendicular
    Correct
  2. B
    Parallel
  3. C
    Same line
  4. D
    At 45°

Correct answer

Perpendicular

Explanation

For perpendicularity: m₁ × m₂ = −1. Here: 1 × (−1) = −1 ✓. The lines are perpendicular.

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