Question

Solve the following system of equations:x + 2y + z = -2-2x + 4y - 4z = -222x + y + 2z = 5

Answer 1

from eq(1):x=-2y-z
substitute this in others eqs,then solve for two variables (y,z)

Answer 2

.
a) (3, -3, 1)
b) (-3, -3, 1)
c) (3, -3, -1)
d) (-3, 3, 1)