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/)