Gradient of Perpendicular Lines Proof

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A simple proof why the product of the gradients of perpendicular lines equal to negative one.
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This is so simple and to the point. Thank you!

ghifarazka
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But slope of X axis and Y axis multiplication not gives -1

mohsinali
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Yeah, good! Just use the transformation theory - > rotation 90 degrees

DANIELDALLAS_MATHs
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Mr Cheow rocking a Giordano shirt(great vid tho)

seanwoo