Multiple Choice

A site surveyor is checking the alignment of two property boundaries defined by the equations 7x + 2y = 3 and 2x + 7y = 5. After converting to slope-intercept form, the surveyor identifies the slopes as -7/2 and -2/7. According to the mathematical rule for perpendicularity, why are these boundaries NOT perpendicular?

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Updated 2026-04-03

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