With all the work you've done on algebra in KS3 Maths, you will by now be familiar with equations. One type you will have come across are the simultaneous equations.
Simultaneous equations have the same values. You should be able to recognise a problem that is based on simultaneous equations – it will have two equations, and include two different variables. When a variable is the subject of one of the equations (it will start with y =… or x =...) substitute that expression into the second equation. This will produce one equation with one unknown, which can be solved. Substitute this value back into the first equation to find the second variable.
Simultaneous equations sound a bit daunting! The subject is not as fearsome as the title suggests. Play the following quiz a few times and read the helpful comments - you will soon find simultaneous equations are a doddle!