This screencast solves a system of two equations in two unknowns by first writing the equations in matrix form and then using matrix inversion to find the solution; the general method for finding the inverse of a 2x2 matrix by hand is explained.

Solving linear equations with matrix inversion (MathsCasts)

These MathsCasts were produced by the mathematics support centres at Swinburne University, the University of Limerick and Loughborough University. They were part of a collaborative research project to develop high quality resources and investigate the effectiveness of MathsCasts to support mathematics learning. The full set of resources are available at http://commons.swin.edu.au/s/mathscasts MathsCasts are licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License

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Solving linear equations with matrix inversion (MathsCasts)

Solving linear equations with matrix inversion (MathsCasts)