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anonymous

  • one year ago

Which equation represents "the sum of eight times a number and seven is twice the number"? 8(7 + 2N) 8N = 7 + 2N 7N + 8 = 2N 8N + 7 = 2N

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  1. mathstudent55
    • one year ago
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    If a number is N, what is eight times the number?

  2. anonymous
    • one year ago
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    im not completely sure

  3. mathstudent55
    • one year ago
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    Ok. A number is 5 What is eight times that number?

  4. anonymous
    • one year ago
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    40

  5. anonymous
    • one year ago
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    its d

  6. mathstudent55
    • one year ago
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    Right. How did you do that? You used multiplication. Since the number was 5, and we wanted 8 times the number, you did 8 * 5. Then you actually multiplied the numbers together and got 40. That was correct. You could do the multiplication because you knew what both numbers were.

  7. anonymous
    • one year ago
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    i whant to be sure its D

  8. mathstudent55
    • one year ago
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    In our case, we don't know what number N is. We just know N represents a number. Then 8 times the number is simply 8 times N, which is 8 * N, or even more simply, 8N

  9. mathstudent55
    • one year ago
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    Ignore direct answers, and learn from an explanation.

  10. anonymous
    • one year ago
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    times is multiplacation 8n then sum is addition 8n+7 twice a number is 2n so 8n+7=2n

  11. mathstudent55
    • one year ago
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    OK so far? The unknown number is N. 8 times the number is 8N.

  12. anonymous
    • one year ago
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    ok i see

  13. mathstudent55
    • one year ago
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    Then the next step is: "the sum of eight times a number and seven" "Sum" is an addition, so we have: 8N + 7

  14. anonymous
    • one year ago
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    i have anouther i whant to see if i got correct ill post it

  15. mathstudent55
    • one year ago
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    Finally, the problem tells us that all that is twice the number. That means 8N + 7 = 2N

  16. mathstudent55
    • one year ago
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    Sure.

  17. anonymous
    • one year ago
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    thanks alot mathstudent and da best

  18. mathstudent55
    • one year ago
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    You're welcome.

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