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The point(-4,5) is the vertex of a squar...

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

A

7x - y + 23 = 0

B

7y + x = 30

C

7y + x = 31

D

x - 7y = 30

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The correct Answer is:
C
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