"Negative reciprocal" but why? slope of a perpendicular line

Опубликовано: 06 Апрель 2026
на канале: bprp math basics
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If we have a line with the equation y=mx+b, any line perpendicular to the given line will have the negative reciprocal for its slope, but why is this the case? We learned this in algebra but what is the reason behind it?

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