MATH TROUBLES HELP ME PLEASE (ALGEBRA 2)?

So, I gotta solve for x and I'm stuck with these problems??

1. -18x = 4x - 11

2. 34 + 16 = 5x + 10

3. 23- 2x = 15 - x

4. -2 (1 - x) + 4x = -3

i really need help so please help me?

Update:

i'd appreciate if you'd show how you did it?? like its great if you give answers but i'd actually like to learn lmao

4 Answers

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  • Anonymous
    8 years ago
    Favorite Answer

    1)

    -18x = 4x - 11

    To make it nicer, +11 to both sides (all steps must be done on both sides of the = sign)

    -18x + 11 = 4x + 0

    Add 18x to both sides

    0 + 11 = 4x + 18x

    Neaten:

    11 = 22x

    Divide by 22

    1/2 = x

    2)

    34 + 16 = 5x + 10

    (I feel like that should have an x on the LHS somewhere?)

    Three choices, then:

    34 + 16 = 5x + 10

    Add 34 + 16:

    50 = 5x + 10

    -10 from both sides:

    40 = 5x + 0

    Divide by 5:

    8 = x

    If instead it should be:

    34 + 16x = 6x + 10

    -10 from both sides:

    24 + 16x = 6x

    -16x from both sides:

    24 = 6x - 16x

    Neaten:

    24 = -10x

    Divide by -10

    -2.4 = x

    Or if it should be 34x + 16 = 5x + 10

    -16 from both sides:

    34x = 5x - 6

    -5x from both sides:

    29x = -6

    divide by 29 (which I'm not going to do in my head...)

    3) 23 - 3x = 15 - x

    -15 from both sides

    8 -3x = -x

    +3x to both sides

    8 = -x + 3x

    Neaten:

    8 = 2x

    Divide by 2:

    4 = x

    4) -2(1-x) + 4x = -3

    First, deal with the bracket by multiplying out:

    -2(1) + (-2)(-x) + 4x = -3

    -2 +2x +4x = -3

    Neaten:

    -2 + 6x = -3

    +2 to both sides:

    6x = -3+2

    6x = -1

    Divide by 6:

    x = -1/6

    Hope that clears it up a bit! :)

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  • Anonymous
    8 years ago

    (1) -18x = 4x - 11

    When you move numbers from one side to the other, you have to change the signs. Therefore:

    -18x - 4x = -11

    -22x = -11

    To find x, you have to get rid of the coefficient and the negative. Therefore:

    x = -11 / -22

    = 1/2

    (2) 34 + 16 = 5x + 10

    50 = 5x + 10

    Same thing as what I said before. When I move a number over, I have to change the signs:

    50 - 10 = 5x

    40 = 5x

    Likewise as what I did earlier.

    40/5 = x

    8 = x

    This is the same as writing: x = 8.

    (3) 23 - 2x = 15 - x

    Nothing new here....you do the same as what we've done previously.

    -2x + x = 15 - 23

    -x = -8

    Divide both sides by '-1'.

    x = 8

    (4) -2(1-x) + 4x = -3

    You expand the equation:

    -2(1) - -2(x) + 4x = -3

    -2 + 2x + 4x = -3

    6x = -3 + 2

    6x = -1

    x = -1/6

    --------------------------------

    I hope this helps! :) If you don't understand you should ask your teacher or someone who could go through it with you.

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  • 8 years ago

    1.) -18x = 4x - 11 balance this out like a scale. whatever you do to one side must be done to the other

    -18x + 11 = 4x Add 11 to each side to get rid of the -11

    11 = 22X add 18x to each side to get rid of the -18x

    x = 2 divide by 11

    2.) 34 + 16 = 5x +10

    40 = 5x + 10

    30 = 5X

    x = 6

    3.) 23 - 2x = 15 - x

    23 = 15 + x

    8 = x

    4.) -2(1-x) + 4x = -3

    -2 +2x + 4x = -3

    -2 + 6x = -3

    6x = -1

    x = -.167

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  • 8 years ago

    1. x= 2

    2. x=8

    3. x=8

    4. x=-6

    Source(s): great at math
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