A number machine is a way of writing rules using a flow diagram. The equation \(3j - 6 = 9\) can be shown on a number machine by writing out the functions that have been applied to \(j\) in the order ...

GCSE WJEC Equations and formulae – WJEC Solving 'algebraic' problems Solve, form and manipulate algebraic expressions including simplifying and rearranging equations. Solve using trial and improvement ...