In the x-y plane, the area of the region bounded by the graph of |x+y| + |x-y| = 2 is
Pick one:
A) 1
B) 12
C) 16
D) 20
E) 24
I've never seen such kind of question in GMAT before.   OK there can be 4 cases:   |x+y| + |x-y| = 2   A. x+y+x-y = 2 --&gt; x=1   B. x+y-x+y = 2 --&gt; y=1   C. -x-y +x-y= 2 --&gt; y=-1   D. -x-y-x+y=2 --&gt; x=-1   The area bounded by 4 graphs x=1, x=-1, y=1, y=-1 will be square with the side of 4 so the area will be 1*1= 
<gadget id="calculator">1*1</gadget>
<output>1</output>
1.   1nswer: 1
<result>A</result>
In the x-y plane, the area of the region bounded by the graph of |x+y| + |x-y| = 2 is