YOU TRY Decide which method to use to solve each system, substitution or elimination, and explain why this method was chosen. Then, solve the system. a) 9x 7y 9 b) 9x 2y 0 c) 4x y 13 2x 9y 2 x y 7 3x 2y 4 ANSWERS TO YOU TRY EXERCISES a) elimination; (1, 0) b) substitution; (2, 9) c) substitution or elimination; (6, 11) Putting It All Together Exercises Do the exercises, and check your work. *Additional answers can be found in the Answers to Exercises appendix. Objective 1: Review the Concepts of Sections 4.1–4.3 Decide which method to use to solve each system, substitution or elimination, and explain why this method was chosen. Then solve the system. 1) 8x 5y 10 2) x 2y 7 2x 3y 8 8x 3y 9 3) 12x 5y 18 4) 11x 10y 4 8x y 1 9x 5y 2 5) y 4x 11 6) 4x 5y 4 x y 8 y 3 4 x 1 2 Solve each system using either the substitution or elimination method. 7) 4x 5y 24 (6, 0) 8) 6y 5x 22 (2, 2) x 3y 6 9x 8y 2 9) 6x 15y 1 10) x 2y 9 (1, 4) 9x 10y 8 7x y 3 11) 10x 4y 7 12) y 6x 5 15x 6y 2 12x 2y 10 13) 10x 9y 4 14) 6x 4y 11 x 1 2 a 2 3 , 1 5 b 1 2 3 2 x 1 4 y 7 8 a , 1b 15) 7y 2x 13 (4, 3) 16) y 6 3x 2y 6 12x y 8 17) 2 5 x 4 5 y 2 18) 5x 4y 14 (10, 9) 1 6 x 1 6 y 1 3 y 8 5 x 7 19) 0.3x 0.1y 0.4 (0, 4) 0.01x 0.05y 0.2 a5 6 , 3 2 b a1 6 , 6b (9, 7) 20) 0.01x 0.06y 0.03 (3, 1) 0.4x 0.3y 1.5 21) 6x 2y 10 21x 7y 35 22) 5 3 x 4 3 y 2 3 10x 8y 5 23) 2 5y 8x (9, 14) y 3 2 x 1 2 24) 5 6 x 3 4 y 2 3 a2, 4 3 b 1 3 x 2y 10 3 25) 2x 3y 8 7x 10y 4 26) 6x 9 13y 4x 3y 2 27) 6(2x 3) y 4(x 3) 5(3x 4) 4y 11 3y 27x 28) 3 5(x 4) 2(1 4y) 2 2(x 10) y 1 3x 5(y 6) 17 29) 2y 2(3x 4) 5(y 2) 17 (1, 1) 4(2x 3) 10 5(y 1) 30) x y 23 2y 3(2x 7) (2, 4) 9y 8 4(x 2) 2(4x 1) 3x 10y 31) y 4x 10x 2y 5 32) x 2 3 y (4, 6) 9x 5y 6 a 68 41 , 64 41 b a 53 34 , 24 17 b a3 4 , 0b a5, 3 4 b a 5 2 , 10b 272 CHAPTER 4 Linear Equations and Inequalities in Two Variables www.mhhe.com/messersmith
messersmith_power_introductory_algebra_1e_ch4_7_10
To see the actual publication please follow the link above