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-   -   How would you solve for n if 9n-10=71 (https://www.askmehelpdesk.com/showthread.php?t=425315)

  • Dec 15, 2009, 01:46 PM
    nikki2424
    how would you solve for n if 9n-10=71
    9n-10=71
    9n+10=+10
    9n=81
    9n/9=81/9
    n=9
  • Dec 15, 2009, 02:01 PM
    nikki2424

    This is correct
  • Dec 15, 2009, 03:13 PM
    mathwiz3502
    It is exactly correct
  • Dec 16, 2009, 07:32 AM
    Unknown008

    Although you got the answer, I don't suggest you put it as you put it. Because the way you put it is confusing.

    Quote:
    Originally Posted by nikki2424
    ]9n-10=71
    9n+10=+10
    9n=81
    9n/9=81/9
    n=9
    Where does the bold part come from?

    You have to show this:

    9n - 10 +10 = 71 + 10

    and not directly add 10, because the other side is not only '10'.
  • Dec 20, 2009, 07:01 PM
    Ajama4

    You are correct
  • Dec 20, 2009, 07:22 PM
    KISS

    The check is:

    9(9)-10 = 71; which is true, so you got the right answer.

    I'm in agreement that it was confusing getting there.

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