Inverse Matrices... (matrix)

[killabee44]

Guys,

I'm trying to find the inverse of a matrix on the TI-89. I am given a set of equations:

Solve the system using the inverse method.
-x+3y+4z=3
2x-2y=4
3y+2z=-1

How would I go about solving this? I know to enter 0 for the missing variables, but I'm not sure which command to use on the TI-89...

When I enter: ([-1,3,4;2,-2,0;0,3,2])^-1 I get the wrong answers..

Thanks.