1.

If the pair of line 2hxy+2gx+2fy+c=0 and the coordinate axes form a rectangle, then the equation of its diagonals are

Answer»

2gx+2fy+c=0, gx-fy=0
2gx+2fy-c=0, gx-fy=0
gx+fy+c=0, gx-fy=0
gx+fy+c=0, gx-fy=0

Answer :A


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