You can write n-linear equations as one matrix equation to solve it. Here you can find great example:
http://blogs.mathworks.com/pick/2007/09/13/matlab-basics-video-solving-linear-equations/ (video!)
See also these pages:
http://en.wikipedia.org/wiki/System_of_linear_equations
http://en.wikipedia.org/wiki/Matrix_equation
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solved set of n-linear equations in matlab [closed]