College Algebra: Module 5: Systems of Equations and Matrices
Solutions for Systems of Linear Equations
Here are instructions for solving three linear equations in three unknowns on the TI 83/84 calculator.
Also, have a look at a couple of solved stated problems involving systems of linear equations.
Instructions for performing exponential regressions on the TI-84, as well as a solved problem that fits a quadratic equation to just three data points here.