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] \quad

D)
\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]$$

Question

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] \quad

D)
 \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]$$

Quizplus · Accepted Answer

The operation $\frac{1}{5} R_1$ means to multiply every element in row 1 by $\frac{1}{5}$, resulting in $-4, 12, 2, 9$ for the first row.

Perform Matrix Row Operations - A) [−41229113−302−7421]\left[ \begin{array} { c c r | r } - 4 & 12 & 2 & 9 \\1 & 13 & - 3 & 0 \\2 & - 7 & 4 & 21\end{array} \right]​−412​1213−7​2−34​9021​​

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