What is the slope of a line perpendicular to the line with equation# y = 4x + 5#?

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May 2, 2015

The 2 lines are perpendicular, one to the other, when the product of their slopes is #-1#.
In this example: #4*(-1/4) = -1.#
Then, the answer is #(-1/4).#

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What is the slope of a line perpendicular to the line with equation# y = 4x + 5#?

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