- Thread starter
- #1

#### karush

##### Well-known member

- Jan 31, 2012

- 2,685

$$a_1\left[

\begin{array}{r}

1\\-2\\0 \end{array}\right],

a_2\left[

\begin{array}{r}

0\\1\\2

\end{array}\right],

a_3\left[

\begin{array}{r}

5\\-6\\8

\end{array}\right],

b=\left[

\begin{array}{r}

2\\-1\\6

\end{array}\right]$$

(rref) augmented matrix is

$$\left[

\begin{array}{ccc|c}

1 & 0 & 5 & 2 \\

0 & 1 & 4 & 3 \\

0 & 0 & 0 & 0

\end{array} \right]$$

from observation this

**is not**a combination

ok well I thot if the bottom row is all 0's then you have 2 equations and 3 answers so not

also, I thot (rref) was all just 1's or 0's

I did it on eMh