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Analytical Geometry

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 Joined: 5 Apr 2012 Post: 1
5 Apr 2012 20:18:55 IST
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if the line (3x-8y+5)+a(5x-3y+10) is parallel to x-axis, then find a
Engineering Entrance , JEE Main , JEE Main & Advanced , Mathematics , Analytical Geometry

if the line (3x-8y+5)+a(5x-3y+10) is parallel to x-axis, then find a

Cool goIITian

Joined: 19 Jan 2012
Posts: 34
5 Apr 2012 20:38:36 IST
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a=-3/5

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Joined: 23 Jan 2007
Posts: 7958
5 Apr 2012 21:21:29 IST
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(3x-8y+5)+a(5x-3y+10)=0  =>  (3+5a)x - (8+3a)y + (5+10a) = 0

Since the line is parallel to x-axis the coefficient of x in the equation must be zero.

3+5a=0  =>  a = -3/5

Hot goIITian

Joined: 4 Apr 2012
Posts: 121
5 Apr 2012 21:24:36 IST
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simple man................ It's -3/5

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