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If (h,k) is the foot of the perpendicula...

If (h,k) is the foot of the perpendicular from `(x_(1),y_(1))` to the line ax+by+c=0,`(a!=0,b!=0)` then `(h-x_(1))/(a)=(k-y_(1))/(b)=(-(ax_(1)+by_(1)+c))/(a^(2)+b^(2))`Find the foot of the perpendicular from (-1,3) to the line 5x-y=18

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