Reflection:

This problem is a great example of a porportional relashionship because whenever X moves 1, Y ALWAYS moves 10.

 

This problem also demonstrates that the unit rate is the slope of the graph because its 10 dollars PER every 1 hour

 

The answer for #9 is NOT a unit rate because a unite rate must be PER 1 unit, so 20 dollares per 2 hours is not a unite rate, but 10 dollars PER 1 hour is.