Question

x-y+2z-w=-1
2x+y-2z-2w=-2
-x+2y-4z+w=1
3x -3w=-3

Answer 1

solve the linear equation by gauss-jordam elimination

Answer 2

^^ yeah do that !

Answer 3

try this:

http://en.reshish.ru/

Answer 4

Solution set:

x1 = -1 + x4
x2 = 2x3

x3, x4 - free

Answer 5

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