# Solving Systems of Linear Equations by Substitution

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1 4.2 Solving Systems of Linear Equations by Substitution How can you use substitution to solve a system of linear equations? 1 ACTIVITY: Using Substitution to Solve a System Work with a partner. Solve each system of linear equations using two methods. Method 1: Solve for x first. Solve for x in one of the equations. Use the expression for x to find the solution of the system. Explain how you did it. Method 2: Solve for y first. Solve for y in one of the equations. Use the expression for y to find the solution of the system. Explain how you did it. Is the solution the same using both methods? a. 6x y = 11 b. 2x 3y = 1 c. 3x + y = 5 2x + 3y = 7 x y = 1 5x 4y = 3 d. 5x y = 2 e. x + y = 1 f. 2x 6y = 6 3x 6y = 12 5x + y = 13 7x 8y = 5 2 ACTIVITY: Writing and Solving a System of Equations COMMON CORE Systems of Equations In this lesson, you will write and solve systems of linear equations by substitution. solve real-life problems. Learning Standards 8.EE.8b 8.EE.8c A.CED.3 A.REI.6 Work with a partner. a. Roll a pair of number cubes that have different colors. Then write the ordered pair shown by the number cubes. The ordered pair at the right is (3, 4). b. Write a system of linear equations that has this ordered pair as its solution. x-value c. Exchange systems with your partner and use one of the methods from Activity 1 to solve the system. y-value 160 Chapter 4 Solving Systems of Linear Equations

2 3 ACTIVITY: Solving a Secret Code Math Practice Check Progress As you complete each system of equations, how do you know your answer is correct? Work with a partner. Decode the quote by Archimedes , (A, C) x + y = 3 (D, E) x + y = 0 (G, H) x + y = 0 x y = 3 x y = 10 x y = 16 (I, L) x + 2y = 9 (M, N) x + 2y = 4 (O, P) x + 2y = 2 2x y = 13 2x y = 12 2x y = 6 (R, S) 2x + y = 21 (T, U) 2x + y = 7 (V, W) 2x + y = 20 x y = 6 x y = 10 x y = 1 4. IN YOUR OWN WORDS How can you use substitution to solve a system of linear equations? Use what you learned about systems of linear equations to complete Exercises 4 6 on page 164. Section 4.2 Solving Systems of Linear Equations by Substitution 161

3 4.2 Lesson Lesson Tutorials Another way to solve systems of linear equations is to use substitution. Solving a System of Linear Equations by Substitution Step 1 Solve one of the equations for one of the variables. Step 2 Substitute the expression from Step 1 into the other equation and solve for the other variable. Step 3 Substitute the value from Step 2 into one of the original equations and solve. Check Equation 1 y = 2x 4 EXAMPLE 6 =? 2( 1) 4 6 = 6 Equation 2 7x 2y = 5 7( 1) 2( 6) =? 5 5 = 5 1 Solving a System of Linear Equations by Substitution Solve the system by substitution. y = 2x 4 Equation 1 7x 2y = 5 Equation 2 Step 1: Equation 1 is already solved for y. Step 2: Substitute 2x 4 for y in Equation 2. 7x 2y = 5 Equation 2 7x 2(2x 4) = 5 Substitute 2x 4 for y. 7x 4x + 8 = 5 Use the Distributive Property. 3x + 8 = 5 Combine like terms. 3x = 3 Subtract 8 from each side. x = 1 Divide each side by 3. Step 3: Substitute 1 for x in Equation 1 and solve for y. y = 2x 4 Equation 1 = 2( 1) 4 Substitute 1 for x. = 2 4 Multiply. = 6 Subtract. The solution is ( 1, 6). Exercises Solve the system of linear equations by substitution. Check your solution. 1. y = 2x x + 2y = 0 3. x = 5y + 3 y = 5x y = 1 x 5 2x + 4y = Chapter 4 Solving Systems of Linear Equations

4 EXAMPLE 2 Real-Life Application You buy a total of 50 turkey burgers and veggie burgers for \$90. You pay \$2 per turkey burger and \$1.50 per veggie burger. Write and solve a system of linear equations to find the number x of turkey burgers and the number y of veggie burgers you buy. Use a verbal model to write a system of linear equations. of turkey burgers, x + of veggie burgers, y = Total number of burgers Cost per turkey burger of turkey burgers, x + Cost per veggie burger of veggie burgers, y = Total cost The system is: x + y = 50 Equation 1 Step 1: Solve Equation 1 for x. 2x + 1.5y = 90 Equation 2 Study Tip It is easiest to solve for a variable that has a coefficient of 1 or 1. x + y = 50 Equation 1 x = 50 y Subtract y from each side. Step 2: Substitute 50 y for x in Equation 2. 2x + 1.5y = 90 Equation 2 2(50 y) + 1.5y = 90 Substitute 50 y for x. Check y + 1.5y = 90 Use the Distributive Property. 0.5y = 10 Simplify. x y 50 2x 1.5y 90 y = 20 Divide each side by 0.5. Step 3: Substitute 20 for y in Equation 1 and solve for x. x + y = 50 Equation x + 20 = 50 Substitute 20 for y. x = 30 Subtract 20 from each side. You buy 30 turkey burgers and 20 veggie burgers. Exercises A juice stand sells lemonade for \$2 per cup and orange juice for \$3 per cup. The juice stand sells a total of 100 cups of juice for \$240. Write and solve a system of linear equations to find the number of cups of lemonade and the number of cups of orange juice sold. Section 4.2 Solving Systems of Linear Equations by Substitution 163

5 4.2 Exercises Help with Homework 1. WRITING Describe how to solve a system of linear equations by substitution. 2. NUMBER SENSE When solving a system of linear equations by substitution, how do you decide which variable to solve for in Step 1? 3. REASONING Does solving a system of linear equations by graphing give the same solution as solving by substitution? Explain your reasoning. 9+(-6)=3 3+(-3)= 4+(-9)= 9+(-1)= Write a system of linear equations that has the ordered pair as its solution. Use a method from Activity 1 to solve the system Tell which equation you would use in Step 1 when solving the system by substitution. Explain your reasoning. 7. 2x + 3y = x + 5y = x + 10y = 14 4x y = 3 x + 6y = 0 5x 9y = 1 Solve the system of linear equations by substitution. Check your solution y = x y = 2x x = 2 y + 7 y = 4x 10 y = 3x 1 3x 2y = x 2y = x = y x 1 3 y = 0 y = 1 2 x 1 x + 7 = y 12x + 3 = y 16. SCHOOL CLUBS There are a total of 64 students in a drama club and a yearbook club. The drama club has 10 more students than the yearbook club. a. Write a system of linear equations that represents esents this situation. b. How many students are in the drama club? the yearbook club? 17. THEATER A drama club earns \$1040 from a production. A total of 64 adult tickets and 132 student tickets are sold. An adult ticket costs twice as much as a student ticket. a. Write a system of linear equations that represents this situation. b. What is the cost of each ticket? 164 Chapter 4 Solving Systems of Linear Equations

6 2 Solve the system of linear equations by substitution. Check your solution. 18. y x = x + 4y = x 5y = 3 2x 5y = 9 3x + 7y = 22 3x + 8y = ERROR ANALYSIS Describe and correct the error in solving the system of linear equations. 2x + y = 5 Equation 1 Step 1: Step 2: 3x 2y = 4 Equation 2 2x + y = 5 2x + ( 2x + 5) = 5 y = 2x + 5 2x 2x + 5 = 5 5 = STRUCTURE The measure of the obtuse angle in the isosceles triangle is two and a half times the measure of one base angle. Write and solve a system of linear equations to find the measures of all the angles. x y x 23. ANIMAL SHELTER An animal shelter has a total of 65 abandoned cats and dogs. The ratio of cats to dogs is 6 : 7. How many cats are in the shelter? How many dogs are in the shelter? Justify your answers. 24. NUMBER SENSE The sum of the digits of a two-digit number is 8. When the digits are reversed, the number increases by 36. Find the original number. 25. Repeated Reasoning A DJ has a total of 1075 dance, rock, and country songs on her system. The dance selection is three times the size of the rock selection. The country selection has 105 more songs than the rock selection. How many songs on the system are dance? rock? country? Write the equation in standard form. (Section 2.4) 26. 3x 9 = 7y y = 2x 28. 6x = y MULTIPLE CHOICE Use the figure to find the measure of 2. (Skills Review Handbook) A 17 B 73 C 83 D t a b Section 4.2 Solving Systems of Linear Equations by Substitution 165

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