Multiple Choice

A construction surveyor is verifying the perpendicular alignment of two layout lines defined by the equations y=βˆ’5xβˆ’4y = -5x - 4 and xβˆ’5y=5x - 5y = 5. After converting the second equation, the surveyor identifies the slopes of the two lines as βˆ’5-5 and rac{1}{5}. Which mathematical term describes the relationship between these two slopes that confirms the lines are perpendicular?

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Updated 2026-04-20

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