1.

If lx+my+n=0 is the perpendicular bisector of the segment of line joining (alpha, beta) and (gamma , beta) then which one of the following is correct ?

Answer»

`(gamma-alpha)/(L) =(delta-BETA)/(m) =(-2(l alpha+ m beta+N))/(l ^(2) +m^(2))`
`(gamma-alpha)/(l) =(delta-beta)/(m) =(2(l alpha+ m beta+n))/(l ^(2) +m^(2))`
`(gamma-alpha)/(l) =(delta-beta)/(m) =(lalpha+ m beta +n)/(l^(2)+ m^(2))`
`(gamma-alpha)/(m) =(delta-beta)/(l) =(lalpha+ m beta +n)/(l^(2)+ m^(2))`

ANSWER :A


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