Question

HELP!!!! Solve the system of equations:
2x+2y+z=-7
-x+2y+4z=-7
x+y+z=-5

The solution is ( _, _, _,)?

Answer 1

use elimination always the quickest :D

Answer 2

can you help?

Answer 3

ok but i shall use augmented matrices it is quicker if i dont have to keep writing the +,= and x y z

2x+2y+z=-7
-x+2y+4z=-7
x+y+z=-5

is