The problem is:

2x + 5y + 4z = 21

4x - 5y +z = 38

6x - z = 17

step by step please.

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- June 3rd 2009, 06:43 PMhelpmeGaussian Elimination
The problem is:

2x + 5y + 4z = 21

4x - 5y +z = 38

6x - z = 17

step by step please. - June 3rd 2009, 07:06 PMProve It
Usually I would say to eliminate the x values first, but in this case it looks easier to eliminate the z's.

Do the following.

and

Now do

.

Now you can solve for x. .

Substitute this value into the other two equations to solve for y and z.

.

.

So your solution is [tex](x, y, z) = (4, -3, 7).

You could substitute these back into your original equation to check if you wish.