An algebraic equation contains one or more letters in it. Each letter in the equation is called a variable. A variable can change in value. We guess at different values for each letter until our ...

Simultaneous equations are two linear equations that can be solved using bar models. By remembering that the same letter will always have the same value we can work out the missing values. To solve ...

Fertility specialists have found a way for women to have babies without men. It involves a cocktail of chemicals acting as an 'artificial sperm' to trick a human egg into forming an embryo. The ...