How to Write a Linear System in Matrix Form

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Homework Statement

Write the given system in the form x'=P(t)x + f(t)

x'=-3y , y'=3x

Homework Equations

x'=P(t)x + f(t)
x(t)=c_1x_1(t)+c_2x_2(t)+...+c_nx_n(t)

The Attempt at a Solution

I have no idea how to start this since my teacher never covered this in our notes and the book doesn't give an example of this type of problem. Please help!

 

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Any one?