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If x-2y =-1 ,2x-y = 7 then find the valu...

If `x-2y =-1` ,`2x-y = 7` then find the value of `x-y`.

A

`(1+3 sqrt2)/(7)`

B

`(1-3sqrt2)/(7)`

C

`(1pm2 sqrt2)/(7)`

D

`(1pm 5 sqrt2)/(7)`

Text Solution

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The correct Answer is:
D
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