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Question

The vertices of a triangle are A(10,4), B(-4,9), and (-2,-1). Find the equation of its altitude which passes through (10,4)


A

x - 5y + 10 = 0

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B

5x - y + 20 = 0

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C

5x - y + 10 = 0

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D

x - 5y + 20 = 0

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Solution

The correct option is A

x - 5y + 10 = 0


Attitude which passes through A is perpendicular to the line BC.


Slope of the line segment BC=

=y2y1x2x1=192+4=102=5
Let slope of the attitude be m
Since, attitude and line segment BC is perpendicular
m1,m2=1
(5),m=1
m=15
Equation of attitude which passes through (10,4) is
yy1=m(xx1)
y4=15(x10)
5y-20=x-10
x-5y+10=0


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