To determine the unit rate, we need to look at the relationship between the distance driven (in miles) and the gallons of gas used.
If the graph shows that for every gallon of gas used, the car travels a certain number of miles, then that number represents the unit rate.
For example, if the graph indicates that the car drives 30 miles for every gallon of gas, the unit rate would be 30 miles per gallon (30 mpg).
Without specific numbers from the graph, I cannot provide an exact answer, but you would select the number of miles per gallon (or similar unit) from the drop-down menu that corresponds to the graph.
In a general format, the unit rate could be expressed as:
"The unit rate is ___ miles per gallon."
Make sure to fill in the blank with the number you derive from examining the graph.