==Key Stage 4=====Meaning==='''Linear''' refers to a straight line. ===About Linearity===: A #Redirect [[Scatter Linear Graph|scatter graph]] with a straight [[Line of Best Fit|line of best fit]] is referred to as a [[linear]] graph.: A '''linear''' graph has a constant [[gradient]]. ===Examples==={| class="wikitable"|-|[[File:ProportionalSketchGraph1.png|center|200px]]|[[File:ProportionalSketchGraph2.png|center|200px]]|[[File:DirectlyProportionalSketchGraph.png|center|200px]]|-| style="height:20px; width:200px; text-align:center;" |This [[Scatter Graph|scatter graph]] shows a [[linear]] relationship where x increases and y increases. <math>y = mx + c</math> Where m, the [[gradient]], is positive.| style="height:20px; width:200px; text-align:center;" |This [[Scatter Graph|scatter graph]] shows a [[linear]] relationship where x increases and y decreases. <math>y = mx + c</math> Where m, the [[gradient]], is negative.| style="height:20px; width:200px; text-align:center;" |This [[Scatter Graph|scatter graph]] shows a [[linear]] relationship that is [[Directly Proportional|directly proportional]] where x doubles, y doubles. <math>y = mx</math> Where m, the [[gradient]], is positive.|}