Y is the total amount that the family pays. 2x represents 2 dollars for every person (so, 2 multiplied by the number of people). Finally, 3 represents the initial amount that they must pay, no matter how many are in the car.
This expression can be used because it costs $2 per person. Therefore, you would need to multiply 2 by however many people there are (x representing the number of people). Then, you would need to add an additional $3 because that is the cost for the car.
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