Before you start, it may be helpful to read the guides on coordinates and graphs from Module 2 (M2) and Module 3 (M3). When two lines are perpendicular, the product of their gradients is 1. Lines A ...

A graph can be used in real life situations to help with working out quantities, often costs. Neve chooses four toppings. Rule across from 4 on the x-axis until you meet the line, and then rule across ...