Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

http://mathworld.wolfram.com/GaussianElimination.html

http://en.wikipedia.org/wiki/Gaussian_elimination

It works, you can do it by hand, but it is not likely to be much fun.

Even in Linear Algebra courses, they don't make you work with anything over 4x4.

There are solvers on line that will do up to 30x30.

http://www.bluebit.gr/matrix-calculator/

Matlab is probably the software of choice for this sort of thing.