4.5 Exercise 12

Perform the indicated operations on the augmented matrix:

ⓐ Interchange rows 1 and 2,

ⓑ Multiply row 1 by 2,

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

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