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===About Proportional Graphs===
: A [[Scatter Graph|scatter graph]] showing a '''linear''' relationship has straight [[Line of Best Fit|line of best fit]].
: On a [[proportional]] [[Scatter Graph|scatter '''linear graph]] '''; when one [[variable]] increases, the other increase or when one increases the other decreases.: A [[proportional]] graph '''linear relationship''' may have a non-zero [[y-intercept]].: If the [[Line of Best Fit|line of best fit]] on for a '''linear relationship''' has a [[y-intercept]] of zero then it is called '[[Directly Proportional|directly '''proportional''']]'.
===Examples===
{| class="wikitable"
|[[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, 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 that is [[proportional]] where x increases, and y decreases.
<math>y = mx + c</math>