4.5 Exercise 11

Perform the indicated operations sequentially on the augmented matrix:

ⓐ Interchange rows 1 and 3.

ⓑ Multiply row 3 by 3.

ⓒ Multiply row 3 by 2 and add to row 2.

$\left[\right. \begin{matrix}5 & & & −2 & & & −2 & & \\ 4 & & & −1 & & & −4 & & \\ −2 & & & 3 & & & 0 & & \end{matrix} \left|\right. \begin{matrix} & & −2 \\ & & 4 \\ & & −1\end{matrix} \left]\right.$