x(t)=6x(t-1)+13y(t-1)-8z(t-1)

y(t)=2x(t-1)+5y(t-1)-2z(t-1) &initial conditions x(0)=1, y(0)=1, z(0)=0

z(t)=7x(t-1)+17y(t-1)-9z(t-1)

I have found the following

1 1/2 -1

0 1/2 1/2 is P

1 1 1

-2 0 0

0 3 0 is the diagonal matrix D

0 0 1

-1 -3 2

2 4 -2 is the inverse of P

1 1 1