2x-y+3z=9,x+y+z=6x-y+z=2 solve equation on matrix inversion method

Answer 1

If you have Ax=B, then x = A^-1*B

Here, A^-1 =
http://www.wolframalpha.com/input/?i=inverse+%7B%7B2,-1,3%7D,%7B1,1,1%7D,%7B1,-1,1%7D%7D