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Math Help - I really need help - Solveing Equations

  1. #1
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    I really need help - Solveing Equations

    Hey,

    I am desperatly confused on this homework, we get it online @ MyMaths.co.uk - Bringing Maths Alive

    I normally ask my dad, he has a maths degree but he is abroad and he doesn't come back till after I need this homework handed in.

    This homework is in Monday, I know you may think it's not urgent now but Im away from Friday-Sunday night so I won't have time, I need to get it done, tonight!

    Ok its about solving equations. These are the questions:

    4x + 8 = 80 -4x
    82-3x=8x -16
    2-6x=9 -7x
    134-4x=6x +24

    6x+11= -101 -8x
    -94-8x=8x +18
    11-8x=121 -43x
    79-6x=12x +23

    My sheet says you can use decimals if neccesary

    Now I can do questions like this: 6x+32=8x+14. The answer would be x = 9 Is there any realation in that to the ones I can't do in bold?

    I'm not asking for the answers, but could someone please explain to me step by step just how to do these questions in bold.

    I would be really thankfull

    If someone could help me out here, thanks.
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  2. #2
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    Quote Originally Posted by Sammy View Post
    Hey,

    I am desperatly confused on this homework, we get it online @ MyMaths.co.uk - Bringing Maths Alive

    I normally ask my dad, he has a maths degree but he is abroad and he doesn't come back till after I need this homework handed in.

    This homework is in Monday, I know you may think it's not urgent now but Im away from Friday-Sunday night so I won't have time, I need to get it done, tonight!

    Ok its about solving equations. These are the questions:

    4x + 8 = 80 -4x
    82-3x=8x -16
    2-6x=9 -7x
    134-4x=6x +24

    6x+11= -101 -8x
    -94-8x=8x +18
    11-8x=121 -43x
    79-6x=12x +23

    My sheet says you can use decimals if neccesary

    Now I can do questions like this: 6x+32=8x+14. The answer would be x = 9 Is there any realation in that to the ones I can't do in bold?

    I'm not asking for the answers, but could someone please explain to me step by step just how to do these questions in bold.

    I would be really thankfull

    If someone could help me out here, thanks.
    Anything you do to one side, you must do to the other...

    EXAMPLE...

    4x + 8 = 80 -4x

    *add 4x to both sides*

    8x + 8 = 80

    *-8 from both sides*

    8x = 72

    *divide both sides by 8*

    x = 9
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  3. #3
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    Quote Originally Posted by Sammy View Post
    Hey,

    I am desperatly confused on this homework, we get it online @ MyMaths.co.uk - Bringing Maths Alive

    I normally ask my dad, he has a maths degree but he is abroad and he doesn't come back till after I need this homework handed in.

    This homework is in Monday, I know you may think it's not urgent now but Im away from Friday-Sunday night so I won't have time, I need to get it done, tonight!

    Ok its about solving equations. These are the questions:

    4x + 8 = 80 -4x
    82-3x=8x -16
    2-6x=9 -7x
    134-4x=6x +24

    6x+11= -101 -8x
    -94-8x=8x +18
    11-8x=121 -43x
    79-6x=12x +23

    My sheet says you can use decimals if neccesary

    Now I can do questions like this: 6x+32=8x+14. The answer would be x = 9 Is there any realation in that to the ones I can't do in bold?

    I'm not asking for the answers, but could someone please explain to me step by step just how to do these questions in bold.

    I would be really thankfull

    If someone could help me out here, thanks.
    I'm not sure why you can do the 6x + 32 = 8x + 14 but not the 4x + 8 = 80 - 4x. Let's give this one a try.
    4x + 8 = 80 - 4x

    Get all the x's on one side:
    4x + 8 + 4x = 80 - 4x + 4x

    8x + 8 = 80

    Now get the constants to one side:
    8x + 8 - 8 = 80 - 8

    8x = 72

    Now get the x by itself:
    \frac{8x}{8} = \frac{72}{8}

    x = 9

    See if you can do the others. They all follow the same pattern.

    -Dan
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  4. #4
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    Ok, I tryed it on a different 1.


    Q) 6x+11 = -101-8x


    6x+11+8x = -101-8x+8x

    14x+11=-101

    -101-11

    = -112

    14x=-112

    14 x -8 = -112

    x = -8.


    Is this correct or not? Once again thanks for the explanation.
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  5. #5
    Member
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    Quote Originally Posted by Sammy View Post
    Ok, I tryed it on a different 1.


    Q) 6x+11 = -101-8x


    6x+11+8x = -101-8x+8x

    14x+11=-101

    -101-11

    = -112

    14x=-112

    14 x -8 = -112

    x = -8.


    Is this correct or not? Once again thanks for the explanation.
    6x+11 = -101-8x

    *add 8x to both sides*

    14x + 11 = -101

    *take 11 from both sides*

    14x = -112

    *divide both sides by 14*

    x = -8


    So yes, that's correct.
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