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Standard 8.EE.5 - Graph proportional relationships, interpreting the unit rate as the slope of the graph. Compare two different proportional relationships represented in different ways.
Source:
http://ctspedmathdude.files.wordpress.com/2013/05/rise-over-run-as-rate-of-change.jpg
Relfextion:
This problem is a great example of a porportional relationship because the slope of the line is always going to be equal no matter how many slope triangles you make.
This problem also demonstrates the unit rate is the slope of the graph because if you convert the slope into unit rate or the unit rate into slope they will always be the same, but scaled differently.
The answer for #9 is not unit rate because the second number in the ratio is not one. In this case the unit rate would be $10/hour which is $20/2 hours simplified.
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