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If the pairs of lines x^2+2xy+ay^2=0 and ax^2+2xy+y^2=0 have exactly one line in common then the joint equation of the other two lines is given by1) 3x^2+8xy-3y^2=0 2) 3x^2+10xy+3y^2=03) y^2+2xy-3x^2=0 4) x^2+2xy-3y^2=0

Answer» If the pairs of lines x^2+2xy+ay^2=0 and ax^2+2xy+y^2=0 have exactly one line in common then the joint equation of the other two lines is given by1) 3x^2+8xy-3y^2=0 2) 3x^2+10xy+3y^2=03) y^2+2xy-3x^2=0 4) x^2+2xy-3y^2=0


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