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Math Help - Last thread for the Day

  1. #1
    LOL
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    Last thread for the Day

    Solve for the Unknown Variable

    7t+9=37


    n+12=-2(3-5n)

    2k+9
    _____=7
    3
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  2. #2
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    Is this the last problem?

    \frac{2k + 9}{3} = 7

    Show us what you got so far. I'll give you a hint in the last one -- multiply both sides by 3 first.


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  3. #3
    LOL
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    Alright so what you do to one side you do to the other so ill give it a try....

    7t+9=37

    7t+9-9=37-9

    t=28

    7t divided by 7 cancels it out

    28 divided by 7 equals 4
    t= 4?
    the brackets confuse me on number 2, anywhoo im going to the gym to relieve some stress, sorry if im annoying you. exams are stressful man
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  4. #4
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    For #2 you use foil.

    n+12=-2(3-5n)

    So you would multiply -2 by 3, and then -2 by -5n so you would essentially get

    n+12=-6+10n
    n-10n=-6-12
    -9n=-18

    And then just like what you just did, you want to divide out the -9 so you can get n by itself and then you would be left with:
    n=2
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  5. #5
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    Quote Originally Posted by peekay View Post
    For #2 you use foil.

    n+12=-2(3-5n)
    Sorry to nitpick, but actually, it's the distributive property. At least that's what we call it where I live.


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