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If (-4,5) is a vertex of a square and on...

If (-4,5) is a vertex of a square and one of its diagonal is 7x-y+8-0.Find the equation of other diagonal

A

x+3y=21

B

2x=3y=7

C

x+7y=31

D

2x+3y=21

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The correct Answer is:
C
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