Help with a linear algebra problem

1. Aug 30, 2008

kurosaki69

i need help with a linear equation problem. I started the problem and after a few steps i checked the problem in the solution manual and there seem to be a typo in the text so i wanted to have someone check my work if i was doing it correctly. if i made a mistake can someone please correct me and tell me what i did wrong.

1. The problem statement, all variables and given/known data

matrix[(1,1,1), (1,1,0), (1,0,0)]

2. Relevant equations
The solution in the manual had the same steps as below only the matrix was different it
was matrix [(1,1,0), (0,0,-1), (0,-1,-1)].

3. The attempt at a solution
so i first i did R2 $$\rightarrow$$ R2 - R1.
Then i did R3$$\rightarrow$$R3-1.
so my new matrix was [(1,1,1), (0,0,-1), (0,-1,-1)].
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Aug 30, 2008

rocomath

You're good so far, keep going.

3. Aug 30, 2008

kurosaki69

so is my matrix correct and there is a typo in the book?

4. Aug 30, 2008

rocomath

Yes, bc R1 should not change.

5. Aug 30, 2008

kurosaki69

thanks a lot now i know the book has a few typos because i have encountered a few