What is the value of \lambda if the straight line (2 x+3 y+4) +\lambda(6 x-y+12)=0 is parallel to y-axis?

UPSC NDA 2 2012 Mathematics Paper

Question : 47 of 120

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What is the value of λ if the straight line (2x+3y+4) +λ(6x−y+12)=0 is parallel to y-axis?

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