Short Answer

Slope Sign Requirement for Perpendicularity

A technical drafter is verifying the alignment of two structural supports defined by the equations 7x+2y=37x + 2y = 3 and 2x+7y=52x + 7y = 5. The drafter identifies the slopes as 72-\frac{7}{2} and 27-\frac{2}{7}. Although these numerical values are reciprocals, state the specific mathematical rule regarding the signs of the slopes that explains why these supports are NOT perpendicular.

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Updated 2026-04-17

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