Simultaneous equations GCSE questions
Two equations, two unknowns. Elimination or substitution. Always find both letters and check in the other equation.
Line them up
Write x under x and y under y before you add or subtract.
Practice questions
Cover the answers and have a go first. Worked solutions are underneath.
x + y = 8, x − y = 2. Solve.
2x + y = 9, x + y = 5. Solve.
3x + 2y = 16, x − 2y = 0. Solve.
Common mistakes
- Stopping after x.
- Adding the equations when the matching coefficients have the same sign and you needed to subtract.
Answers and working
Frequently asked questions
Is this Higher only?
Simple integer pairs appear on Foundation. Harder coefficients are Higher.
Want unlimited practice?
ReviseEasy marks your answers instantly and builds a plan around the topics you keep dropping marks on.
Practise more on ReviseEasy →Related revision
More GCSE revision
ReviseEasy is a GCSE revision website, not a Maths-only site. Lessons, quizzes and flashcards are live for Maths, Combined Science, Triple Biology, Chemistry and Physics, English Language and English Literature. History, Geography and languages are next.