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Find the volume of the solid bounded by the coordinate planes and the plane $8x + 7y + z = 56$.

The solution states: $$ V= \int_0^9 \int_0^{8-\frac{8}{9}x} 72-8x-9y \; dy\; dx$$


But I am unsure as to why the integration limit is what it is especially the limit of integration on $x$. Can anyone clarify?

2 Answers 2