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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

`x+3 y-21`

B

`2 x 3 y-7`

C

`x+7 y=31`

D

`2 x | 3 y=21`

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The correct Answer is:
C
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