The lines
Question:

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

  1. (–1, 1] 

  2. $(0, \infty)$

  3. $[1, \infty)$

  4. $(-1, \infty)$


Correct Option: , 3

Solution:

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