Hello i got a problem!

ima decide a inverkar to this Matrix A=1 0 -1 1 an it says clue ima set B= x y z tand decide x,y,z,t, for B shall be inverse to A.( its 2x2 the first 2 number are the number on top and the last 2 is at bottom idk what u say on english

Its a 2x2 Matrix sorry for not writing it with latex and sorry for My bad english.

So i did A•B and get C= 1x 1y, -1x+z, -1y+1t

idk why i did not write as t insted of having one before byt hope u guys did understand and looking forward to se all help