Section 2.2

I thought it was very interesting to find out that inverse matrices are hardly ever used in algorithms. I thought that might be the simplest thing to do if it was necessary. Is it inefficient because of time or space components? What other alternatives do they use when they need to use the inverse matrix? What is the algorithm used for the inverse function on MatLab? I thought that forward and backward substitution was also very interesting. I liked how that worked.