If the pair of lines a x^2+2 h x y+b y^2+2 g x+2 f y+c=0 intersect on the y-axis then (a) 2 fgh=b...

If the pair of lines a x^2+2 h x y+b y^2+2 g x+2 f y+c=0 intersect on the y-axis then
(a) 2 fgh=bg^2+ch^2
(b) bg^2=ch^2
(c) a b c=2 f g h
(d) none of these

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