inverse matrix

how do i find the inverse matrix?

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Describing how to do this by hand is a lengthy process that can sometimes be very "messy"........

Here's a website that covers it.......

http://www.purplemath.com/modules/mtrxinvr.htm

If you want to use a computer application to do it (my advice!!), here's a site that will do that (and WAY more....i.e., just about any matrix operation you want !!)

http://www.wolframalpha.com/examples/Matrices.html