Weekly Maths Problem

Tommy wants to take part in the Orchard Training Charity Bike Event next year. Last month he felt that his bike was getting too small for him to ride with a fully straightened knee. He is hoping for Christmas that his parents will buy him a new bike. There is a great bike on sale in the Cycle Shop and it has multiple gears. Great for riding the South Downs and up the great big hill in the middle. He visits the shop on Saturday and tries the middle gear out first. There is a proportional relationship between the number of times Tommy peddles (we will call this x) and the number times the wheels rotate (we will call this y). When he turns the pedals 6 times the wheels rotate 12. Write this relation using x and y as an equation.

You can share your answers here on Facebook or with me as I visit during the week. Remember you need to show your workings out to get the maximum points.