# Homework Help: Linear Algebra: Matlab Question

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1. Feb 13, 2017

### mmont012

I am taking a linear algebra class, and it has a required lab associated with it. Here is the following problem that I must solve using Matlab

1. The problem statement, all variables and given/known data

Write a function using row reduction to find the inverse for any given 2x2 matrix. Name your function your initial + inv(M), the output will be the inverse matrix. Test your function with the matrices in problem 1 and check the results by multiplying the inverse to the matrix for the linear system:

x1-2x2=3
2x1+4x2=-5

Solve it by using the inverse matrix you find and then use M/B. Compare the results.
Note: You can't use rref or use inv(M) in your function, you can only use row reduction)

2. Relevant equations
Here are the matrices from problem 1:
M1: [2,3;4,5]
M2: [1,-2,0;4,-7,1;0,3,5]

3. The attempt at a solution
I'm new to Matlab and I don't know what the teacher is asking. If someone could clarify the instructions that would be very helpful.

As a side note, I typed everything word for word from the handout.
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EDIT:
I figured it out.

% Let A= Matrix, Let IM= Identity matrix
x=A/IM

Ugh.... so simple.... I wish that I didn't waste so much time on this problem.

Thank you for looking.

Last edited: Feb 13, 2017
2. Feb 14, 2017

### Staff: Mentor

I don't see how this solves the problem you are asked.