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Questions  

 The line L14x+3y12=0 intersects the x and y -axis at A and B, respectively. A varıable ine 

 perpendicular to L1 intersects the x - and the y -axis at P and Q , respectively. Then the locus of the circumcenter  of triangle ABQ is 

a
3x−4y+2=0
b
4x+3y+7=0
c
6x−8y+7=0
d
None of theses

detailed solution

Correct option is C

Clearly, the circumcenter of triangle ABQ will lie on the perpendicular bisector of line AB.If A(3,0) and B(0,4) then midpoint of AB =32,2 Let the equation of perpendicular bisector be 3x-4y+k=0, which passes through 32,2Now, the equation of perpendicular bisector of line AB is 3x−4y+72=0 . Hence,  the locus of circumcenter is 6x−8y+7=0

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