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A : The foot of the perpendicular from (...

A : The foot of the perpendicular from (3, 4) on the line `3x-4y+5=0` is `(81//25, 92//25) `
R : If (h, k) is the foot of the perpendicular from `(x_(1), y_(1))` to the line `ax+by+c=0` then `(h-x_(1))/(a)=(h-k_(1))/(b)=(-(ax_(1)+by_(1)+c))/(a^(2)+b^(2))`

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