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The equations of the lines represented by the equation `ax^2 + (a + b)xy + by^2 + x + y = 0` are

A

`ax+by+1=0,x+y=0`

B

`ax+by-1=0,x+y=0`

C

`ax+by+1=0,x-y=0`

D

None of these

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The correct Answer is:
A
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