The locus of the centre of the circle passing through the
origin and the points of intersection and of any line through
and the coordinate axes is ,where
Let the coordinates of and be and
respectively. Then, equation of is
Since it passes through
The triangle is a right-angled triangle. So, it is a diameter
of the circle passing through , and . So, coordinates of the
centre of the circle are
Let be the centre of the circle. Then
Substituting values of , in , we get:
Hence, the locus of is or
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