Building Skills

  1. 9. 1×1

  2. 11. 2×4

  3. 13. 2×3

  4. 15. a13=3, a31=9, a33=11, a34=12

  5. 17. No, it is not a ­rectangular array of numbers.

  6. 19. [ 242131 ]

  7. 21. [ 5711131719 ]

  8. 23. [ 12382391645632 ]

  9. 25. { x+2y3z=42x3y+z=53x3y+2z=7

  10. 27. { xy+z=22x+y3z=6

  11. 29. [ 123011 ]

  12. 31. [ 123401530011 ]

  13. 33. [ 457542 ]14R1[ 15474542 ]5R1+R2R2[ 15474094274 ]49R2[ 15474013 ]

  14. 35. [ 143103200753 ]13R2[ 1431012300753 ]7R2+R3R3[ 14310123007133 ]3R3[ 1431012300019 ]

  15. 37. No, because Property 2 is not satisfied

  16. 39. The matrix is in reduced row-echelon form because Properties 1–4 are satisfied.

  17. 41. The matrix is in reduced row-echelon form because Properties 1–4 are satisfied.

  18. 43. The matrix is in reduced row-echelon form because Properties 1–4 are ...

Get College Algebra, 4th Edition now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.