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anilorap
x-y+2z-w=-1 2x+y-2z-2w=-2 -x+2y-4z+w=1 3x -3w=-3
solve the linear equation by gauss-jordam elimination
try this: http://en.reshish.ru/
Solution set: x1 = -1 + x4 x2 = 2x3 x3, x4 - free
Here are a couple more: - create a 4 row X 5 column matrix, fill in the numbers and solve: http://gregthatcher.com/Mathematics/GaussJordan.aspx http://www.idomaths.com/gauss_jordan.php