1.

Equation of the sidesoverset(harr)("BC"), overset(harr)("CA"), overset(harr)("AB") of a triangle ABC are U_(r ) = a_(r )x+b_(r )y+c_(r )=0, r=1,2,3 respectively then equation of line parallel to overset(harr)("BC") and passing through A is

Answer»

`(a_(3)b_(1)-a_(1)b_(3))U_(2)+(a_(2)b_(1)-a_(1)b_(2))U_(3)=0`
`(a_(3)b_(1)-a_(1)b_(3))U_(2)-(a_(2)b_(1)-a_(1)b_(2))U_(3)=0`
`(a_(3)b_(1)+a_(1)b_(3))U_(2)+(a_(2)b_(1)+a_(1)b_(2))U_(3)=0`
`(a_(3)b_(1)+a_(1)b_(3))U_(2)-(a_(2)b_(1)+a_(1)b_(2))U_(3)=0`

Answer :B


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