Jayne stopped to get gas before going on a road trip. The tank already had 4 gallons of gas in it. Which equation relates the total amount of gasoline in the tank, y , to the number of gallons that she put in the tank, x ?

The tank starts with 4 gallons, and Jayne adds x gallons. The total amount is the starting amount plus the amount added, so y = 4 + x. Therefore, the correct choice is “y is equal to 4 plus x.”

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