Solve the System, If Possible $\left\{ \begin{array} { l } x + y = - 9 \\y + z = - 15 \\2 x - z = 7\end{array} \right.$

Multiple Choice

Solve the system, if possible. $\left\{ \begin{array} { l } x + y = - 9 \\y + z = - 15 \\2 x - z = 7\end{array} \right.$

A) x = -9, y = 12, z = 5
B) x = 1, y = -10, z = -5
C) x = -1, y = 10, z = 5
D) x = -9, y = 1, z = 5
E) no solution; inconsistent system