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anonymous

  • 5 years ago

solve using the multiplication principle. -5/8 x = -9/10

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  1. anonymous
    • 5 years ago
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    multiply both sides by -1, then multiply both sides by 8 and finally multiply both sides by 1/5

  2. anonymous
    • 5 years ago
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    like this? 5/40 x = 9/50

  3. anonymous
    • 5 years ago
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    no.

  4. anonymous
    • 5 years ago
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    post what you got when you multiplied both sides by -1

  5. anonymous
    • 5 years ago
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    5/8 x = 9/10

  6. anonymous
    • 5 years ago
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    then post what you got after multiplying both sides by 8

  7. anonymous
    • 5 years ago
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    5x = 72/10

  8. anonymous
    • 5 years ago
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    then post what you get when you multiply both sides by 1/5

  9. anonymous
    • 5 years ago
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    did you get it?

  10. anonymous
    • 5 years ago
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    x = 72/50

  11. anonymous
    • 5 years ago
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    there you go. you can cancel out 2 in the numerator and denominator to get x = 36/25

  12. anonymous
    • 5 years ago
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    wow, i did it! thx!

  13. anonymous
    • 5 years ago
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    great!

  14. anonymous
    • 5 years ago
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    what is 2/3 times 3/2?

  15. anonymous
    • 5 years ago
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    6/6 =1?

  16. anonymous
    • 5 years ago
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    what is 4/3 times 3/4?

  17. anonymous
    • 5 years ago
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    12/12 = 1

  18. anonymous
    • 5 years ago
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    so what is -5/8 times -8/5

  19. anonymous
    • 5 years ago
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    40/40 = 1

  20. anonymous
    • 5 years ago
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    so -5/8x * -8/5 = -9/10*-8/5 x = 9*8/5*10 x = 72/50 = 36/25

  21. anonymous
    • 5 years ago
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    the lesson here is if you multiply a number n by 1/n, you will always get 1. 1/n is called the multiplicative identity of n

  22. anonymous
    • 5 years ago
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    oh ok, i see now. great! thx!

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