Question

Can someone please look at the attachment and tell me if I did this correcty? My instructions are to "Solve the system of equations by finding the inverse of the matrix of coefficients". On the left side, I did it he way Sal Kahn showed on his video here ( http://www.khanacademy.org/video/matrices-to-solve-a-system-of-equations?playlist=Linear%20Algebra). On the right side, I was attempting to use our online matrix calculator to check the inverse, and it says that it is "not a square matrix". What did I do wrong?

Answer 1

Everything you did is correct.

Answer 2

Thank you,, looks like there was an error with the online calculator....I reloaded it and then it worked, lol. Was able to verify my solution.