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Two consecutive sides of a parallelogram are `4x+5y=0` and `7x+2y=0` . If the equation of one diagonal is `11 x=7y=9,` find the equation of the other diagonal.

A

`x+2y =0`

B

`2x+y=0`

C

`x-y =0`

D

None of these

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The correct Answer is:
C
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