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: A [[Scatter 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 that is [[proportional]] where x increases, 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 that is [[proportional]] where x increases, 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.
|}