Find and by writing a system of differential eqns as a matrix eqn and diagonalizing the matrix.

The system of eqns is

with IC's and

Im normally fine with these, and its porbably something really obvious thats making me stuck.

Anyway,

I need to put it in the form Ax = b.

Something like and

anyway, i know A isnt correct, im just really having trouble concentrating. Need ....even had to check this post about 10 times to make sure it was right