# Homework Help: Solving Matrix of Differential Equations With Initial Values

1. Apr 20, 2012

### TrueStar

1. The problem statement, all variables and given/known data
Solve the matrix of differential equations with given initial values.

dx/dt= (-6 2) x
(-3 -1)

Initial value is x(0) = -2
-5

2. Relevant equations

(A-λI)=o

3. The attempt at a solution

My eigenvalues are -4 and 3

My eigenvectors for -4 are 1 and 1 and the eigenvectors for -3 are 1 on the top row and 3/2 on the bottom.

I write out the equations to look like:

C1e^-4t + C2e^-3t
C1e^-4t + 3/2C2e^-3t

I have IVs of -2 on the top row and -5 on the bottom row. To plug these in correctly,do I use the top row values for the top row equation and same for the bottom? If so, I'm getting C1=4 and C2=-6 but this is wrong in our online homework program.

2. Apr 20, 2012

### TrueStar

I figured out what I was doing wrong. It was a matter of entering the answer into the online homework program incorrectly, not so much that the answers were wrong.