A taxi ride costs $3 plus $2.50 per mile. Write and graph an equation in two variables that represents the total cost of a taxi ride. Let m represent number of miles and c represent the total cost (in dollars) of the taxi ride.
Since you don't know how many miles you are traveling in the taxi, you can use the variable m to represent miles. 3 is the original fee. So, 3 + 2.50m = c is your answer.