answered
2014-07-24 13:27:52 -0600
I did mine with my integral in the order $\delta x\delta y\delta z$ like yours, Anonymous, and I got my final triple integral to be $$\int_{0}^{2}\int_{0}^{\frac{2-z}{2}}\int_{0}^{2-2y-z}$$. We have done the same thing except for the $\delta y$ integral. I believe that for the $\delta y$ integral we set in the original equation $x = 0$ and solve for $y$, which gives us $2y + z = 2$ or, when we solve for $y$, $y = \frac {2-z}{2}$. Because we are solving for the volume of the plane in the first octant which means all $x, y,$ and $z$ values must be positive, we know that the bounds for $y$ will be $0\leq y\leq \frac {2-z}{2}$.
This is basically what Tiffany said, but because we both did our integrals in the same order, I thought it might be helpful. Best of luck on the quiz tomorrow!