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I need to solve a matrix. I have 3 equations, 3 unknowns, straightforward stuff. And I know it's invertible (doing transformations for hamiltonian dynamics, so I know they made it invertible). I know my calculator and a ton of websites can easily solve any matrix with real coefficients, but here they are general variables.

Does anyone know a good website (or how to do it on the TI-83, or TI-89) that will do this?

For example, solving something like:

a*x + b*y = 3

ba*x + 4b*y = 5, finding x and y as functions of a and b.

Any good way?

Thanks!

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# What can I use to solve a general matrix?

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