Ex$.660.$ y$($t$)\text{'}\text{'}+95$y$($t$)\text{'}+64$y$($t$)=87$u$($t$).$ Assign phase variables: x$1($t$)=$ y$($t$)$ and x$2($t$)=$ x$1($t$)\text{'}.$ Determine the state variable equations: x$($t$)\text{'}=$ A x$($t$)+$ B u$($t$)$ and y$($t$)=$ C x$($t$)+$ D u$($t$).$ Answers: a$11,$a$12,$a$21,$a$22,$b$1,$b$2,$c$1,$c$2,$d ans:$9$