:) Hello. I am Ukrainian, so I apologize to my English. Help me, please, to do my work.
{x-4y+2z=-5,
{4x+y-3z=-3,
{2x+3y+4z=1.
(1 -4 2) (x) (-5)
(4 1 -3) (y) (-3)
(2 3 4) (z) (1)
AX=B | A (-1)
X=A(-1) B
A=
(1 -4 2)
(4 1 -3)
(2 3 4)
(A|E) --> (E|A(-1))
What next?