I've showed the base step for n=1
For the inductive step:
Suppose P(k) is true for some k
\begin{bmatrix}
x_{k}\\ x_{k-1}
\end{bmatrix} = \begin{bmatrix}
5 &-6 \\
1 & 0
\end{bmatrix}^{k-1}\begin{bmatrix}
1\\0
\end{bmatrix}
Then for n=k+1
\begin{bmatrix}
x_{k+1}\\ x_{k}...