Solve the System of Equations A) $( 2 , - 1,9 )$

Multiple Choice

Solve the system of equations.
- $$\begin{array} { l } x _ { 1 } - x _ { 2 } + x _ { 3 } = 8 \\x _ { 1 } + x _ { 2 } + x _ { 3 } = 6 \\x _ { 1 } + x _ { 2 } - x _ { 3 } = - 12\end{array}$$

A) $( 2 , - 1,9 )$
B) $( - 2 , - 1,9 )$
C) $( - 2 , - 1 , - 9 )$
D) $( 2 , - 1 , - 9 )$