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The lines x + y =|a| and ax-y= 1 interse...

The lines x + y =|a| and ax-y= 1 intersect each other in the first quadrant. Then the set of all possible values of a is the interval.

A

`(0, oo)`

B

`[1, oo)`

C

`(-1, oo)`

D

`(-1, 1]` .

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