How do you do 18?The math lesson is linear systems in three variables 18. Adrian, Nathan, and Brian bought lunch from the concession stand. Adrian paid $5.50 for a burger, mes,and a drink; Nathan paid $4.00 for a burger and a drink; and Brian paid $4.25 for a burger and fries.a. Write three equations modeling the cost of their lunches using b, f, and d to represent the cost of aburger, fries, and a drink.b. Solve the system of equations to determine the cost of each food item.19. Larry has a total of 24 nickels, dimes, and quarters whose total value is $3. The number of nickels equalsthe sum of the number of dimes and quarters.a. Write three equations modeling the total number of coins, the value of the coins, and the relationshipbetween the number of nickels and other coins.b. Solve the system of equations to determine how many of each coin Larry has.B. ExercisesSolve each system.20. x + 2y + z = 8y-3z = 921. 2x + 3y – z = 52y + 5z = 11z =-2

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18. Adrian, Nathan, and Brian bought lunch from the concession stand. Adria and a drink; Nathan paid $4.00 for a burger and a drink; and Brian paid $- a. Write three equations modeling the cost of their lunches using b, f, and burger, fries, and a drink.

18. Adrian, Nathan, and Brian bought lunch from the concession stand. Adria and a drink; Nathan paid $4.00 for a burger and a drink; and Brian paid $- a. Write three equations modeling the cost of their lunches using b, f, and burger, fries, and a drink.

Elementary Algebra

17th Edition

ISBN:9780998625713

Author:Lynn Marecek, MaryAnne Anthony-Smith

Publisher:Lynn Marecek, MaryAnne Anthony-Smith

Chapter5: Systems Of Linear Equations

Section5.2: Solve Systems Of Equations By Substitution

Problem 122E: When Gloria spent 15 minutes on the elliptical trainer and then did circuit training for 30 minutes,...

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