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anonymous

  • one year ago

WILL BEST ANSWER A number is decreased by seven. Then, the new number is multiplied by 3 to get an answer of -9. What is the original number? -30 30 4 -4 So confusing? How do I work it out?

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  1. AbdullahM
    • one year ago
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    So to work it out, we need to work backwords. They said our final answer was -9. And we need to find the original number. So we have to go backwords with the steps doing the opposite of what they had originally did to get to the first number. Do you understand?

  2. anonymous
    • one year ago
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    Yeah a little, how would I work it backwards?

  3. AbdullahM
    • one year ago
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    So for example, A number is multiplied by 4, and now we get 20 So to work this backwords, we have to divide 20 by 4 to know which number when multiplied by 4 got us to 20. And that is 5. That is just an example. Does that make it more clear to you? (:

  4. anonymous
    • one year ago
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    Yes, Thank you!

  5. AbdullahM
    • one year ago
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    So, the question is: A number is decreased by seven. Then, the new number is multiplied by 3 to get an answer of -9. So we have to work one step at a time backwords until we reach the beginning of the question. So what number multiplied by 3 would get us -9?

  6. anonymous
    • one year ago
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    Thinking...

  7. anonymous
    • one year ago
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    we would multiply by 3 on the answer choices to see which one equals -9 right? @AbdullahM

  8. AbdullahM
    • one year ago
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    not in the answer choices, just divide -9 by 3 to find out what the previous number was. We're working backwords and once we finish all the steps we will get the answer which is one of the answer choices.

  9. anonymous
    • one year ago
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    so... We divide the answer choices by -9 and then multiply by 3?

  10. anonymous
    • one year ago
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    @AbdullahM

  11. AbdullahM
    • one year ago
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    we have nothing to do with the answer choices right now.

  12. AbdullahM
    • one year ago
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    So, first tell me what is \(\sf\Large \frac{-9}{3}=?\)

  13. anonymous
    • one year ago
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    @AbdullahM -3

  14. AbdullahM
    • one year ago
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    Ok, now we move back to the step before it which is: A number is decreased by seven

  15. AbdullahM
    • one year ago
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    So lets say the original number is 'n'. Then that means n - 7 = -3

  16. anonymous
    • one year ago
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    4!!!!!

  17. anonymous
    • one year ago
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    Thank you! @AbdullahM

  18. AbdullahM
    • one year ago
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    Good job! :D

  19. anonymous
    • one year ago
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    :)

  20. AbdullahM
    • one year ago
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    And just ot make sure, you can use 4 and work through the steps like normal to make sure we arrive at -9

  21. anonymous
    • one year ago
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    Thank you so much!

  22. AbdullahM
    • one year ago
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    A number is decreased by seven. Then, the new number is multiplied by 3 to get an answer of -9. So we have 4 - 7 = -3 and then -3 x 3 = -9 So it works, and is your correct answer :)

  23. anonymous
    • one year ago
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    Okay Thank you!

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