Use Matrices and Gauss-Jordan Elimination to Solve Systems
-$$\begin{aligned}
- 3 x - y - 7 z & = - 76 \
3 x + 3 y - 6 z & = - 27 \
- 9 x - 2 y + z & = - 23
\end{aligned}$$
A) $\{ ( 2,7,9 ) \}$
B) $\{ ( 2,9,7 ) \}$
C) $\{ ( - 2,7,4 ) \}$
D) $\{ ( 4,7 , - 2 ) \}$

Question

Quizplus · Accepted Answer

The correct answer is A because the system of equations has only one solution, which is (2, 7, 9).

Use Matrices and Gauss-Jordan Elimination to Solve Systems - −3x−y−7z=−763x+3y−6z=−27−9x−2y+z=−23\begin{aligned}- 3 x - y - 7 z & = - 76 \\3 x + 3 y - 6 z & = - 27 \\- 9 x - 2 y + z & = - 23\end{aligned}−3x−y−7z3x+3y−6z−9x−2y+z​=−76=−27=−23​

Use Matrices and Gauss-Jordan Elimination to Solve Systems
- $\begin{aligned}- 3 x - y - 7 z & = - 76 \\3 x + 3 y - 6 z & = - 27 \\- 9 x - 2 y + z & = - 23\end{aligned}$