Question

Which of the following situations could be represented with the given system of equations?
2x-y=0
4x+7y=1,170

A.
Tickets to a school play cost $4 for students and $7 for adults. Twice as many adults as students attended the play. Total ticket sales were $1,170.
B.
Korey would like to sell his comic book collection to a local comic shop. In order to offer the comic shop a good deal, he separates his comics into two different price groups, $4 and $7. There are twice as many $4 books as $7 books. If the comic store bought the entire collection, Korey would make $1,170.

Answer 1

C.
Dan was selling perfume door-to-door in a local neighborhood. He focused on two different kinds of perfume. One cost only $4 per vial, the other cost $7 per vial. As an incentive to buy one vial of each type, Dan offered a free $4 vial if a customer purchased both a $4 and $7 vial. Dan made $1,170 using this sales technique.
D.
Rodney is starting a new job at a concession stand at a baseball park. He is responsible for selling and serving two sizes of drinks. A small beverage costs $4, and a large beverage costs $7. At the end of the night, Rodney knows that he sold twice as many small drinks as large drinks. When he closed out his drawer, it contained $1,170.

Answer 2

let the number of students be x and number adults = y
number adults = 2 * number of students
can you write this in equation form?