Exercises 16.4, page 456

  1. 1. x = 2 ,  y =  − 3

  2. 3. x = 92 ,  y = 5

  3. 5. x = 13 ,  y =  − 3

  4. 7. x =  − 4 ,  y = 2 ,  z =  − 1

  5. 9. x =  − 32 ,  y =  − 2

  6. 11. x = 1.6 ,  y =  − 2.5

  7. 13. x = 2 ,  y =  − 4 ,  z = 1

  8. 15. x = 2 ,  y =  − 12 ,  z = 3

  9. 17. x = 2 ,  y = 2

  10. 19. x = 13 ,  y =  − 2

  11. 21. x = 1 ,  y =  − 2 ,  z =  − 3

  12. 23. u = 2 ,  v =  − 5 ,  w = 4

  13. 25. x = 2 ,  y = 3 ,  z =  − 2 ,  t = 1

  14. 27. v = 2 ,  w =  − 1 ,  x = 12 ,  y = 32 ,  z =  − 3

  15. 29. x =  ± 2 ,  y =  − 2

  16. 31. x = 1 ,  y =  − 2 ;  The three lines meet at the point (1 ,   − 2) . 

  17. 33. A = 1180 N ,  B = 1860 N

  18. 35. 10 V, 8 V

  19. 37. 40 mL of 20% solution, 8 mL of 50% solution

  20. 39. 6.4 L, 1.6 L, 2.0 L

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