(I) We realize that, each point in a line is invariant under the appearance in a similar line.
As the focuses
and
lie on the x-hub.
In this manner,
and
are invariant under appearance in x-hub.
Along these lines, the condition of line
is
Additionally,
and
are likewise invariant under appearance in y-hub.
Along these lines, the condition of line
is
(ii)
in
Also,