Answer:
x = (-15)
y = 6
z = 3
Step-by-step explanation:
x + y + z = -6______(1)
2x - y - 5z = -21____(2)
-x - y -6z = -9______(3)
(1) + (2)
z = 3, (1) + (2)
x = (-15), (1)
a I think is correct yea
x = 6