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# Variable substitution in multivariate Integrals

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calculate the integarl of (3x + 4) over the region bounded by
the lines y =x, y = x-2, y =-2x and y = 3 - 2x;

Use:

x = 1/3(u+ v), y = 1/3(v - 2u)

https://brainmass.com/math/integrals/variable-substitution-multivariate-integrals-212660

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