GCSE Edexcel Straight line graphs - Edexcel Parallel and perpendicular lines Graphs show the relationship between two variables and are often seen in newspapers and the media. People who work in ...

Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to ...

Parallel lines are a fixed distance apart and will never meet, no matter how long they are extended. Lines that are parallel have the same gradient. The graphs above, \(y = 2x + 1\) and \(y = 2x ...