If the pairs of lines x^2+2x y+a y^2=0 ...

If the pairs of lines `x^2+2x y+a y^2=0` and `a x^2+2x y+y^2=0` have exactly one line in common, then the joint equation of the other two lines is given by (1) `3x^2+8x y-3y^2=0` (2) `3x^2+10 x y+3y^2=0` (3) `y^2+2x y-3x^2=0` (4) `x^2+2x y-3y^2=0`

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