Answer:
No
Explanation:
The solutions to the system of equations are x = 6, y = -4, z = -3.
The easiest way to do this would be to substitute these values in for each equation and see if they are true or false.
x + y + z = -1
6 - 4 - 3 = -1
-1 = -1 ✔
x - 2y - z = 11
6 -2(-4) -(-3) = 11
6 + 8 + 3 = 11
17 = 11 ✖
Just by substituting the values in for the second equation, it does not work, so no, the solutions to the system is not correct.