Perform Matrix Row Operations
- A) $$\left[ \begin{array} { c c r | r } - 4 & 12 & 2 & 9 \\1 & 13 & - 3 & 0 \\2 & - 7 & 4 & 21\end{array} \right]$$

Multiple Choice

Perform Matrix Row Operations
- $$\left[ \begin{array} { r r r | r } - 20 & 60 & 10 & 45 \\1 & 13 & - 3 & 0 \\2 & - 7 & 4 & 21\end{array} \right] \frac { 1 } { 5 } \mathrm { R } _ { 1 }$$

A)
$$\left[ \begin{array} { c c r | r } - 4 & 12 & 2 & 9 \\1 & 13 & - 3 & 0 \\2 & - 7 & 4 & 21\end{array} \right]$$
B)

$$\left[ \begin{array} { c c r | r } - 20 & 60 & 10 & 45 \\\frac { 1 } { 5 } & \frac { 13 } { 5 } & - \frac { 3 } { 5 } & 0 \\2 & - 7 & 4 & 21\end{array} \right]$$
C)
$$\left[ \begin{array} { r r r | r } - 4 & 12 & 2 & 45 \\1 & 13 & - 3 & 0 \\2 & - 7 & 4 & 21\end{array} \right] \quadD) \left[ \begin{array} { r r r | r } - 4 & 12 & 2 & 9 \\\frac { 1 } { 5 } & \frac { 13 } { 5 } & - \frac { 3 } { 5 } & 0 \\\frac { 2 } { 5 } - \frac { 7 } { 5 } & \frac { 4 } { 5 } & \frac { 21 } { 5 }\end{array} \right]$$