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A point (-4,5) is the vertex of a square...

A point (-4,5) is the vertex of a square and one of its diagonals is `7 x-y+8=0`. The equation of the other diagonals is

A

`7 x-y+23=0`

B

`x+7 y=31`

C

`x-7 y=37`

D

none of these

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The correct Answer is:
B
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