Hi guys! 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!