Hi, I have a midterm tomorrow for my Lin Alg course and I was doing some review probs and I cant seem to understand this one..(adsbygoogle = window.adsbygoogle || []).push({});

http://img119.imageshack.us/img119/239/39786409wb4.jpg [Broken]

Can someone help me and explain how to do this one!!

I know I can just find the whole vector

x1,x2,x3,x4 by just multiplying by A^-1 but on a midterm I dont thinK I will want to waste time and find the inverse of such a matrix if there is another way to approach this problem.

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# Using Determinant

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