# Systems of Equations

## "Why study systems of equations?

**The 1997-8 El Nino ...**

The El Nino occurs every few years. There is an increase in the sea temperature to the west of South America. The El Nino causes extreme weather around the globe, including droughts in Australia and Asia.

**Modelling**changes in the climate requires an understanding of many types of

**equations**, including

**simultaneous equations.**

In this chapter, we see how to solve simple sets of linear equations and go on to solve pairs of non-linear equations.

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