1.

Reflection of the line x+y+1=0 in the line lx+my+n=0 is

Answer»

`(x+y+1)(L+m)-2(l^(2)+m^(2))(lx+my+n)=0`
`(x+y+1)(l^(2)+m^(2))-2(l+m)(lx+my+n)=0`
`(l+m+1)(x+y)-2(lx+my)(l^(2)+m^(2))=0`
NONE of these

ANSWER :B


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