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