Identify the elementary row operation being performed to obtain the new row-equivalent matrix.
Original Matrix New Row-Equivalent Matrix $$\left[ \begin{array} { r r r }
4 & - 1 & - 5 \
- 5 & 4 & 9
\end{array} \right]$$ $$\left[ \begin{array} { r r r }
4 & - 1 & - 5 \
11 & 0 & - 11
\end{array} \right]$$
A)Add 4 times Row 2 to Row 1.
B)Add 5 times Row 2 to Row 1.
C)Add 9 times Row 1 to Row 2.
D)Add 4 times Row 1 to Row 2.
E)Add 5 times Row 1 to Row 2.

Question

Identify the elementary row operation being performed to obtain the new row-equivalent matrix. ​
Original Matrix New Row-Equivalent Matrix $$\left[ \begin{array} { r r r } 
4 & - 1 & - 5 \
- 5 & 4 & 9
\end{array} \right]$$ $$\left[ \begin{array} { r r r } 
4 & - 1 & - 5 \
11 & 0 & - 11
\end{array} \right]$$ ​
A)Add 4 times Row 2 to Row 1.
B)Add 5 times Row 2 to Row 1.
C)Add 9 times Row 1 to Row 2.
D)Add 4 times Row 1 to Row 2.
E)Add 5 times Row 1 to Row 2.

Quizplus · Accepted Answer

The operation performed is adding 4 times the first row to the second row, which changes the second row to $11, 0, -11$.

Identify the Elementary Row Operation Being Performed to Obtain the New