4.5 Exercise 39

Perform the indicated operations on the augmented matrices.

$\left[\right. \begin{aligned}6 & & & −5 & & & 2 \\ 2 & & & 1 & & & −4 \\ 3 & & & −3 & & & 1\end{aligned} \left|\right. \begin{matrix}3 \\ 5 \\ −1\end{matrix} \left]\right.$

ⓐ Interchange rows 2 and 3

ⓑ Multiply row 2 by 5

ⓒ Multiply row 3 by $−2$ and add to row 1.