In the x-y plane, the area of the region bounded by the graph of |x+y| + |x-y| = 12 is
Choose one
A) 8	B) 12	C) 16	D) 1296	E) 24
I've never seen such kind of question in GMAT before.   OK there can be 4 cases:   |x+y| + |x-y| = 12   A. x+y+x-y = 12 --&gt; x=6   B. x+y-x+y = 12 --&gt; y=6   C. -x-y +x-y= 12 --&gt; y=-6   D. -x-y-x+y=12 --&gt; x=-6   The area bounded by 4 graphs x=6, x=-6, y=6, y=-6 will be square with the side of 4 so the area will be 36*36= 
<gadget id="calculator">36*36</gadget>
<output>1_296</output>
1296   Answer:1296
<result>D</result>
In the x-y plane, the area of the region bounded by the graph of |x+y| + |x-y| = 12 is