Help with the following Matlab question

 

What is Gaussian Elimination with backward substitutions?

Explain your answer using your own example with MATLAB.  Create a 3x3 matrix by using the following command in MATLAB:

>>d = randi(3,3)

After explaining the Gaussian elimination, solve your matrix equation using MATLAB and section 6.3 to solve using:

x = inv(A) * B  

or 

x = A\B

Copy and paste in the edit window to SHOW ALL YOUR Work.