A triangle is bounded by the lines y = x, y = -x, and y = 1   When setting up an intergral to find mass or inertia or whatever, why can I not set it up as integral(1, -1) integral(1, x) dydx and instead need to set it up as integral(1, 0) integral(y, -y) dxdy

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter8: Further Techniques And Applications Of Integration
Section8.3: Volume And Average Value
Problem 17E
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A triangle is bounded by the lines y = x, y = -x, and y = 1

 

When setting up an intergral to find mass or inertia or whatever, why can I not set it up as

integral(1, -1) integral(1, x) dydx

and instead need to set it up as

integral(1, 0) integral(y, -y) dxdy

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