Cortez,HowGan

The products of the slopes of perpendicular lines=_____?

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3 months ago 4

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  1. J

    Slopes are tangents of the angles of inclination.
    Product of slopes is tanθ tan(θ+90°) = tanθ(-cotθ) = -1
    because tan and cot are reciprocals.

    This only fails when one of the lines is vertical (because that line has undefined slope).

  2. Pope

    If neither of the lines is vertical, the product is -1.

  3. C

    yes

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