How does matlab solve matrices?

I was just wondering if anybody knew the method used by matlab to solve matrices, when the command A\b is used. For example, does it used back substitution without gaussian elimination, or does it use back substitution with gaussian elimination, or does it use LU decomposition?

Thank you

Answer 1

[Matt J]

Depends on the type of matrix, see

http://www.mathworks.com/help/matlab/math/systems-of-linear-equations.html#f4-965550

[Sarah]

Thank you!