During one month, a rental agency rented a total of 155 cars, trucks, and vans. nine times as many cars were rented as vans, and three times as many vans were rented as trucks. let x represent cars, let y represent vans and let z represent trucks. write a system of three equations that represent the number of each vehicle rented

Can someone explain the elimination method to me for this problem?

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The table below lists recommended amounts of food to order for 10 party guests. how much of each food item should nathan and amanda order for a graduation party with 55 guests? use the table to answer. item amount fried chicken 16 pieces lasagna 7 pounds deli meats 1.8 pounds sliced cheese 1 and two fifths pounds bakery buns 1 dozen potato salad 2 pounds