Apply Gaussian Elimination to Systems Without Unique Solutions
Use Gaussian $$\begin{aligned}x + 8 y + 8 z & = 8 \\7 x + 7 y + z & = 1 \\8 x + 15 y + 9 z & = - 9\end{aligned}$$

Multiple Choice

Apply Gaussian Elimination to Systems Without Unique Solutions
Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists.
- $$\begin{aligned}x + 8 y + 8 z & = 8 \\7 x + 7 y + z & = 1 \\8 x + 15 y + 9 z & = - 9\end{aligned}$$

A) $\varnothing$
B) $\{ ( 0,0,1 ) \}$
C) $\{ ( 1 , - 1,1 ) \}$
D) $\{ ( - 1,0,1 ) \}$