Equations solve by matrix method

Question

(1) x-y+3z=2
(2) 2x+y+2z=2
(3) -2x-2y+z=3

Answer 1

1.x=y−3z+2
2.x=−12y−z+1
3.x=−y+12z+−32

Answer 2

Please explain nour

Answer 3

You can check your calculations here:

http://www.wolframalpha.com/input/?i=solve+{{1%2C-1%2C3}%2C{2%2C1%2C2}%2C{-2%2C-2%2C1}}*{{x}%2C{y}%2C{z}}+%3D+{{2}%2C{2}%2C{3}}

Answer 4

sorry, i got that from a culcaltuor