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Help, I need to represent this as a triple integral, but first I must see how I can describe as the tetrahedron bounded by $x + y + z = 0$, $x + y - z = 1$, $x-y-z=0$ and $ 2x - y= 1$

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Thanks for the quick response on accepting answers. Who are "they"? How are we supposed to tell you what they do if you don't tell us who they are? –  joriki Dec 3 '12 at 7:02
What is the question here? What are you trying to describe? –  wj32 Dec 3 '12 at 8:58
@wj32, I'm guessing OP wants to write a triple integral over the region bounded by the graphs of those equations, and wants to know how to set up the limits of integration. –  Gerry Myerson Dec 3 '12 at 23:15

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