Building Skills

  1. 9. x=2, u=−3

  2. 11. x=−1, y=3

  3. 13. x=2, y=1

  4. 15. ∅

  5. 17.

    1. [0251]

    2. [2217]

    3. [−3−6−9−12]

    4. [56518]

    5. [102511]

    6. [6102313]

  6. 19. a, b, d, e, and f are not defined.

    1. [−6−912−15]

  7. 21.

    1. [71−1−114214]

    2. [1−1−1−390−2−1−2]

    3. [−12036−15−600−3]

    4. [6−2−3−8232−4−2−3]

    5. [467−7042121718]

    6. [61−7−21616−13−1−10]

  8. 23.

    1. [43−3407403]

    2. [−21−32830−2−3]

    3. [−3−69−9−12−15−630]

    4. [−34−9720112−5−6]

    5. [16120441292812−3]

    6. [−914522−213−14−1−22]

  9. 25. X=[−4−21150]

  10. 27. X=[02−1232124]

  11. 29. X=[−4−432−1292−4]

  12. 31. X=[12−9412−2−52−5]

  13. 33.

    1. AB=[411623]

    2. BA=[101826]

  14. 35.

    1. AB=[473−12]

    2. BA=[−13410−13568−40]

  15. 37.

    1. AB=[16]

    2. BA=[235−4−6−1081220]

  16. 39.

    1. AB=[78−8]

    2. The product BA is not defined.

  17. 41.

    1. AB=[107271941010]

    2. BA=[745083191814]

  18. 43. AB=[131731382616]≠[62219211611−110]=BA

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