Q.The pair of lines $x^2 - 4xy + 3y^2 + 2x - 6y + k = 0$ is perpendicular to the pair $x^2 - 4xy + 3y^2 = 0$ if k equals

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Q.The pair of lines x2−4xy+3y2+2x−6y+k=0x^2 - 4xy + 3y^2 + 2x - 6y + k = 0x2−4xy+3y2+2x−6y+k=0 is perpendicular to the pair x2−4xy+3y2=0x^2 - 4xy + 3y^2 = 0x2−4xy+3y2=0 if k equals