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- Julius NLv 75 months ago
Standard form: x1-3x2-2x3+x4=-3; -2x1+7x2+x3-2x4=-1; 3x1-7x2-3x3+3x4=-5; 5x1+x2+4x3-2x4=18;

Coefficient matrix:

1, -3, -2, 1,

-2, 7, 1, -2,

3, -7, -3, 3,

5, 1, 4, -2,

------------------------

Inverse of coefficient matrix:

0.04761905, 0.23809524, 0.23809524, 0.14285714,

-0.33333333, 0.33333333, 0.33333333, 0,

-0.77777778, -0.22222222, 0.11111111, 0,

-1.6031746, 0.31746032, 0.98412698, -0.14285714,

Solution:

(x1, x2, x3, x4) = (1, -1, 2, -3)

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- Steve4PhysicsLv 76 months ago
Use one of the online calculators such as https://quickmath.com/webMathematica3/quickmath/eq...

You will need to call your variables x, y, z and w.

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