1. Jul 14, 2012

### g.lemaitre

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

2. Relevant equations
3. The attempt at a solution
Do you see how 1 1 1 changes to 3 3 3. i know why gaussian elimination you can change any vector by multiplying it by anything you want. but for some reason i have difficulty believing that you're allowed to do that here. is that what they're doing? just multiplying that vector by 3 so as to facilitate the arithmetic. Or maybe they're multiplying both vectors by 3, so as to get rid of the 1/3, but that doesn't explain how the 1/3 gets on the left side of the parentheses.

2. Jul 14, 2012

### grzz

There is nothing wrong with

(1 1 1) = ($\frac{3}{3}$ $\frac{3}{3}$ $\frac{3}{3}) =$$\frac{1}{3}$(3 3 3)

3. Jul 14, 2012

ok, thanks