Suppose one cell phone company charges $0.10 per minute for phone calls.
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1 What s for Lunch? Solving More Systems Learning Goals In this lesson, you will: Write a linear system of equations to represent a problem context. Choose the best method to solve a linear system of equations. Suppose one cell phone company charges $0.10 per minute for phone calls. Another company charges $60 per month for unlimited call time. Can you write a system of equations to compare the two plans? Which one would be best for you? Which one would be best for your parents? 12.2 Solving More Systems 655
2 Problem 1 Fundraising One day each month the Family and Consumer Science classes offer a deli lunch for the faculty and staff of the school to purchase. The staff has a choice of either a chef salad for $5.75 or a hoagie for $5. Today the Family and Consumer Science classes sold 85 lunches for a total of $464. Determine how many chef salads and hoagies were sold. 1. Write an equation in standard form that gives the total number of lunches in terms of the number of chef salads sold and the number of hoagies sold. Let x represent the number of chef salads sold, and let y represent the number of hoagies sold. 2. Write an equation in standard form that represents the amount of money collected. Use the same variables as those used in Question Write a system of linear equations to represent this problem situation. 4. What methods can you use to solve this system of linear equations? Think about all the strategies you have used in previous lessons. 656 Chapter 12 More with Systems of Equations
3 5. Determine the solution of this linear system of equations by using linear combinations and check your answer. 6. Interpret your solution to the linear system in terms of the problem situation. Problem 2 More Fundraising The Jewelry Club is making friendship bracelets with the school colors to sell in the school store. The bracelets are black and orange and come in two lengths: 5 inches and 7 inches. The club has enough beads to make a total of 84 bracelets. They have made 49 bracelets, which represents 1 the number of 5-inch bracelets plus 3 the number of 7-inch bracelets 2 4 they plan to make and sell. 1. Write an equation in standard form to represent the total number of bracelets the Jewelry Club can make out of the beads that they have. Let x represent the number of 5-inch bracelets, and let y represent the number of 7-inch bracelets. 2. Write an equation in standard form to represent the number of bracelets the Jewelry Club has made so far. Use the same variables as those used in Question Solving More Systems 657
4 3. Write a system of linear equations that represents the problem situation. 4. Karyn says that the first step she would take to solve this system would be to first multiply the second equation by the least common denominator (LCD) of the fractions. Is she correct? Explain your reasoning. 5. Rewrite the equation containing fractions as an equivalent equation without fractions. 6. Determine the solution to the system of equations by using linear combinations and check your answer. 7. Interpret the solution of the linear system in terms of the problem situation. 658 Chapter 12 More with Systems of Equations
5 8. Solve each linear system using linear combinations. Check all solutions. a. x 1 2y 5 2 5x 2 3y b. 1 x y 5 3 3x 1 5y Solving More Systems 659
6 0.6x 1 0.2y c. 0.5x 2 0.2y y x y 5 17 d. 1 2 x Chapter 12 More with Systems of Equations
7 Talk the Talk You have used three different methods for solving systems of equations: graphing, substitution, and linear combinations. 1. Describe how to use each method and the characteristics of the system that makes this method most appropriate. a. Graphing Method: b. Substitution Method: c. Linear Combinations Method: Which method do you like best? Be prepared to share your solutions and methods Solving More Systems 661
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