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For using Gaussian Elimination by back substitution watch this video http://www.bing.com/videos/search?q=gaussian+elimination&view=detail&mid=F73E805AF544772115BAF73E805AF544772115BA&first=0&FORM=NVPFVR&qpvt=gaussian+elimination
Hi I just posted you a Video, that explains how to do the whole thing. You need to watch it and try and do the problem and get the answer. Show your work and I will see where you go wrong. Otherwise the video is quite clear and you learn a lot from that.
huh huh I see what you are doing here.. Good luck
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