Answer:
x=-2, y=7, and z=6
Step-by-step explanation:
3x + 2y +z = 14
6x + 2y + 6z = 38
x + 2y + z = 18
Take the first and subtract the third.
2x = -4
x = -2
Now the equations become.
2y + z = 20 (both the first and third)
2y + 6z = 50
Subtract the first from the second.
5z=30
z=6
Substitute back.
2y + 6(6) = 50
2y = 14
y=7
