If the pair of line ax^2+2hxy+by^2+2gx+2...

If the pair of line `ax^2+2hxy+by^2+2gx+2fy+c=0` intersect on the y-axis, then

`2fgh=bg^2+ch^2`

`bg^2nech^2`

`abc=2fgh`

`2fgh=af+ch^2`

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