They’re “linear” because the only allowable power is exactly 1 and graphs of solutions to the equations form planes. A common example of a linear system — also likely familiar to math students — ...

The solution to the equation is \(x = -1\). This is an identity because when you expand the bracket on the right of the identity sign, it gives the same expression as on the left of the identity sign.

Learn about and revise how to create and solve simultaneous equations, including the use of graphs to produce solutions with Bitesize GCSE Maths Edexcel .