GCSE Maths Revision Guide
Simultaneous Equations
Solve two equations at the same time using elimination or substitution. This free GCSE Maths module combines short explanations, worked examples, flashcard-style recall, and timed practice so students can revise the topic without creating an account.
Foundation Skills
Elimination Method
Multiply one or both equations so one variable has the same coefficient. Then Add or Subtract to get rid of it.
Substitution Method
Rearrange one equation for one variable (e.g. x = ...) and "plug it" into the other.
Example: y = 2x, 3x + y = 10 -> 3x + 2x = 10
Higher Skills
Linear and Quadratic
Always use substitution. Express the linear as x = ... or y = ..., then substitute into the quadratic.
Graphical Solutions
The solution is the coordinates (x, y) where the two lines INTERSECT.