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If (-4,5) is one vertex and 7x-y+8 = 0 ...

If (-4,5) is one vertex and 7x-y+8 = 0 is one diagonal of a square, then the equation of the second diagonal is

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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