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Thread: 3x+68=9x+18 x=?

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    Regular Member 111's Avatar
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    Default 3x+68=9x+18 x=?

    This is my daughters home work, she nor me can do this one. can anyone help.

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    Regular Member Marcosuk's Avatar
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    I got 88 using google??


    Used this http://numberz.co.uk/ES.html

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    Full Member merikiito's Avatar
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    Simplifying
    3x + 68 = 9x + 18x

    Reorder the terms:
    68 + 3x = 9x + 18x

    Combine like terms: 9x + 18x = 27x
    68 + 3x = 27x

    Solving
    68 + 3x = 27x

    Move all terms containing x to the left, all other terms to the right.

    Add '-27x' to each side of the equation.
    68 + 3x + -27x = 27x + -27x

    Combine like terms: 3x + -27x = -24x
    68 + -24x = 27x + -27x

    Combine like terms: 27x + -27x = 0
    68 + -24x = 0

    Add '-68' to each side of the equation.
    68 + -68 + -24x = 0 + -68

    Combine like terms: 68 + -68 = 0
    0 + -24x = 0 + -68
    -24x = 0 + -68

    Combine like terms: 0 + -68 = -68
    -24x = -68

    Divide each side by '-24'.
    x = 2.833333333

    Simplifying
    x = 2.833333333
    Lois Griffin: Peter! You're bribing your daughter with a car?
    Peter Griffin: Ah, c'mon, Lois, isn't 'bribe' just another word for 'love'?

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    Full Member merikiito's Avatar
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    that was my quick working out, it could be wrong as its been a long time since i used google lol
    Lois Griffin: Peter! You're bribing your daughter with a car?
    Peter Griffin: Ah, c'mon, Lois, isn't 'bribe' just another word for 'love'?

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    Regular Member 111's Avatar
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    Thanks guys, I'll give her these answers

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    Quote Originally Posted by merikiito View Post
    Simplifying
    3x + 68 = 9x + 18x

    Reorder the terms:
    68 + 3x = 9x + 18x

    Combine like terms: 9x + 18x = 27x
    68 + 3x = 27x

    Solving
    68 + 3x = 27x

    Move all terms containing x to the left, all other terms to the right.

    Add '-27x' to each side of the equation.
    68 + 3x + -27x = 27x + -27x

    Combine like terms: 3x + -27x = -24x
    68 + -24x = 27x + -27x

    Combine like terms: 27x + -27x = 0
    68 + -24x = 0

    Add '-68' to each side of the equation.
    68 + -68 + -24x = 0 + -68

    Combine like terms: 68 + -68 = 0
    0 + -24x = 0 + -68
    -24x = 0 + -68

    Combine like terms: 0 + -68 = -68
    -24x = -68

    Divide each side by '-24'.
    x = 2.833333333

    Simplifying
    x = 2.833333333
    Somehow using the word "Simplifying" does not compute with me!!

    Glad my homework was not this hard.... when i actually did it!!

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    lol i thought it was just x=2 as in 32+68 is the same as 92+18 therefore x is 2. thats why i didnt finish school i suppose, the above answer seems alot more convincing even although i didnt understand any of it

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    Regular Member jimbojetset's Avatar
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    Default

    Quote Originally Posted by merikiito View Post
    Simplifying


    Reorder the terms:
    68 + 3x = 9x + 18x

    Combine like terms: 9x + 18x = 27x
    68 + 3x = 27x

    Solving
    68 + 3x = 27x

    Move all terms containing x to the left, all other terms to the right.

    Add '-27x' to each side of the equation.
    68 + 3x + -27x = 27x + -27x

    Combine like terms: 3x + -27x = -24x
    68 + -24x = 27x + -27x

    Combine like terms: 27x + -27x = 0
    68 + -24x = 0

    Add '-68' to each side of the equation.
    68 + -68 + -24x = 0 + -68

    Combine like terms: 68 + -68 = 0
    0 + -24x = 0 + -68
    -24x = 0 + -68

    Combine like terms: 0 + -68 = -68
    -24x = -68

    Divide each side by '-24'.
    x = 2.833333333

    Simplifying
    x = 2.833333333
    I think you misread the question...

    its 3x + 68 = 9x + 18 not 3x + 68 = 9x + 18x

    the last x 'x=?' signifies they want to solve for x


    3x + 68 = 9x + 18

    68 - 18 = 9x - 3x

    50 = 6x

    50/6 = x

    x= 8.33
    Last edited by jimbojetset; 14th November 2010 at 21:13.

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    Regular Member no1golfer's Avatar
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    Default

    Quote Originally Posted by merikiito View Post
    Simplifying
    3x + 68 = 9x + 18x

    Reorder the terms:
    68 + 3x = 9x + 18x

    Combine like terms: 9x + 18x = 27x
    68 + 3x = 27x

    Solving
    68 + 3x = 27x

    Move all terms containing x to the left, all other terms to the right.

    Add '-27x' to each side of the equation.
    68 + 3x + -27x = 27x + -27x

    Combine like terms: 3x + -27x = -24x
    68 + -24x = 27x + -27x

    Combine like terms: 27x + -27x = 0
    68 + -24x = 0

    Add '-68' to each side of the equation.
    68 + -68 + -24x = 0 + -68

    Combine like terms: 68 + -68 = 0
    0 + -24x = 0 + -68
    -24x = 0 + -68

    Combine like terms: 0 + -68 = -68
    -24x = -68

    Divide each side by '-24'.
    x = 2.833333333

    Simplifying
    x = 2.833333333

  10. #10
    Regular Member 111's Avatar
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    Yup sorry as jimbojetset says, she needs to know what X equals, I dont understand any of this stuff

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