Use a Graphing Calculator to Express Solutions with Approximations to the Nearest

Multiple Choice

Use a graphing calculator to Express solutions with approximations to the nearest thousandth.
- $$\begin{array} { l } x - y + z = 1 \\x + y + z = 3 \\x + y - z = - 3\end{array}$$

A) $\{ ( - 1,3,1 ) \}$
B) $\{ ( 3 , - 1,1 ) \}$
C) $\{ ( - 1,1,3 ) \}$
D) $\varnothing$