Use Gauss-Jordan elimination process to solve the following system of linear equations.
-x - 9y + 9z = 29
-2x - 9y - 9z = 49
2x + 18y - 18z = 31
x = -2, y = -4, z = -1
x = -3, y = -8, z = -2
No solution.
x = -1, y = -4, z = 1
Infinitely many solutions.
None of the above.