**Key Ideas**

Formulae are meaningful equations.

Equations/ formulae describes relationship between variables (which we will look in greater depth).

We will learn techniques to solve equations (i.e. to find out the unknown variables, usually denoted by

*x*). That is where we carry out the

**balancing act**(i.e. to balance the equation through addition/ subtraction/ multiplication/ division).

**Let's access the Health Promotion Board website to use the**

**BMI Calculator**

*Source: Health Promotion Board, Singapore website (http://www.hpb.gov.sg/)*

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