At one particular restaurant, each pizza roll has 70 calories and each mini hot dog has 60 calories. A combined meal of mini hot dogs and pizza rolls has been shown to have 1,140 total calories and twice as many mini hot dogs as pizza rolls. Write a system of equations that can be used to determine the number of pizza rolls in the combo meal and the number of mini hot dogs in the combo meal. Define the variables you will use to write the system.
