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ICSE Class 10 Answered

Find the coordinate of the foot of the perpendicular drawn from the point (-1,-2) on the line 3x+4y=12.
Asked by kabitajai14 | 11 Jan, 2019, 08:55: PM
answered-by-expert Expert Answer
Equation of perpendicular line :-  4x - 3y = k .......(1)
 
Above line passes through (-1, -2),  Hence  4(-1) - 3(-2) = k  or  k = 2 .
 
Foot of the perpendicular is obtained by solving following equations
 
3x+4y = 12
 
4x-3y = 2
 
we get answer   x = 44/25,  y = 42/25  . Hence foot of perpendicular  [ (44/25), (42/25) ]
Answered by Thiyagarajan K | 12 Jan, 2019, 02:19: PM

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