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First, find the slope for the line. Choose any 2 points and note their coordinates. I'll take (0,4) and (2,10) as an example. Then you apply your formula, remembering each coordinate comes in the form of .
The slope () is 3.
In this case, the slope represents the price per kilometer.
So, the fare is $3 per kilometer + the base fare, which is the value already present at 0km. According to the graph, when ,
.
Let's assume the following:
Price per Kilometer,
Base Fare,
Amount of Kilometers,
Total Cost
The total fare would be calculated by the following formula:
Using the given values:
In conclusion, the total cost for 6km is $22. Option A.