# Maths KS3 / GCSE: Algebra

**A man is trying to work out how much he can afford to pay for his mobile phone contract, taking into account handset, call plan, text messages and data.**

He uses an algebraic formula to determine affordability.

A couple are at the cinema, but there are no prices on the popcorn and drinks.

The woman forms and solves simultaneous equations to work out how much each costs.

This is from the series: Real Life Maths

*Teacher Notes*

*The video can be featured in the classroom to strengthen the learner’s key skills to solve linear equations by way of balance and inverse / addition.*

*Learners in groups could investigate the affordability of various mobile phone deals and what are the best options according to a given budget and lifestyle and showcase a presentation of their findings.*

*Learners in groups could set up their cab company and using maps and scales calculate the costing’s of certain routes, factoring fuel charges and profitability using equations to substitute values.*

*Carousel lesson - Each table is given several questions to complete in a given set time to find two unknowns using simultaneous equations, and rotate the groups until all students have accessed all the questions.*

*The questions could vary from postage stamps, production items on a production line; such as the price of nuts and bolts, forming and solving simultaneous equations.*

*Curriculum Notes*

*This clip will be relevant for teaching Maths at KS3/GCSE in England Wales and Northern Ireland. Also at National 4, 5 and Higher in Scotland.*

*This topic appears in OCR, Edexcel, AQA, WJEC in England and Wales, CCEA GCSE in Northern Ireland and SQA in Scotland.*