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## Homework Statement

Give the general solution of the equation Ax=b in standard form.

The matrix is this: (sorry I can't do the long bracket like there should be)

[ 1 1 1 -1 0

2 0 4 1 -1

1 2 0 -2 2

0 1 -1 2 4] = A

[-1

10

-3

7] = b

## Homework Equations

None

## The Attempt at a Solution

Can you tell me if this is the correct reduced echelon form?

[ 1 1 -1 0

0 1 -1 -1 2

0 0 0 1 3

0 0 0 0 -7]

[-2

5

13

12]

I'm also having trouble finding the general solution, but I think it's because my reduced echelon form is wrong. I don't really even understand the entire concept of these types of problems so I'm struggling. I missed a couple days of class and am trying to figure it out from the book, but the answers aren't in the back so I can't check if I'm right... If you could tell me how to find the general solution, it would really help me. Thanks!