Let A =

1 0 -1

2 1 -2

0 1 1

find A^-1 of the above matrix using inverse matrices and hence solve the bottom 2 systems:

x - z = 3

2x + y - 2z = 0

y + z = 15

2x - y = 1

3x - y + z = -2

2x - y + z = 3

i got A^-1 =

3 -1 1

-2 1 0

2 -1 1

I solved for system 1, how do I solve for system 2 can you please demonstrate.