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Math Help - URGENT! :)

  1. #1
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    Post URGENT! :)

    Hi I need some help with my math homework and i cant seem to get any of it done. Ur gonna think im SOOO stupid for not being able to know this... lol but yeah. PLEASE HELP ME !!!

    1. -4.7 + 8.6x = -29.64

    2. 5.4 = y/1.5 + 2.3

    3. 6.4 - q/3.8 - 10.9

    4. 2n + 0.5(n - 9) = 4.5

    5. -7 = 0.75(3 + 10k) - 5k

    6. -15 = -5h + 0.4(40 - 3h)

    7. a - 1.5(a + 8) = 10

    8. 4t - 10 = 12 + 2(t + 8)

    9. 19w + 16 = 4(7 + w) + 3

    10. 5(c + 9) = -3(21 + c)

    11. 3g - 2(g + 4) = 8(g - 1)

    THANKS!!!!!!!
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  2. #2
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    Hey,

    What's stopping you doing these equations? Don't you understand what to do with them?

    They all seem to be fairly straight forward equations which can be solve by the most important equation rule: do the same to both sides! when you get the unknown on one side of the equation then you're pretty much done with these.
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  3. #3
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    Thanks, Tony.
    But where do I start in the equation?
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  4. #4
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    -4.7 + 8.6x = -29.64

    move the -4.7 over to the other side of the equation

    8.6x = -29.64 + 4.7

    then divide both sides through by 8.6 to get the value of x

    do this format for each of the equations

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  5. #5
    Senior Member euclid2's Avatar
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    Quote Originally Posted by Lolli Lolli :) View Post
    Hi I need some help with my math homework and i cant seem to get any of it done. Ur gonna think im SOOO stupid for not being able to know this... lol but yeah. PLEASE HELP ME !!!

    1. -4.7 + 8.6x = -29.64

    2. 5.4 = y/1.5 + 2.3

    3. 6.4 - q/3.8 - 10.9

    4. 2n + 0.5(n - 9) = 4.5

    5. -7 = 0.75(3 + 10k) - 5k

    6. -15 = -5h + 0.4(40 - 3h)

    7. a - 1.5(a + 8) = 10

    8. 4t - 10 = 12 + 2(t + 8)

    9. 19w + 16 = 4(7 + w) + 3

    10. 5(c + 9) = -3(21 + c)

    11. 3g - 2(g + 4) = 8(g - 1)

    THANKS!!!!!!!
    1. If you are simply solving for the variable x, you must first isolate x in all of the equations.
    For example for #1

    -4.7+8.6x=-29.64
    move -4.7 to the other side to isolate x
    change to positive because moving to other side
    8.6x=-29.64+4.7
    8.6x=-24.94
    divide by number infront of x to solve
    x=-24.94/8.6
    x=-2.9

    Follow the same procedure for all

    * always divide by the variable when you isolate it, for some of these you will need to expand before you can do that, but always remember to just move it to the other side, while changing the sign
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  6. #6
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    Quote Originally Posted by euclid2 View Post
    1. If you are simply solving for the variable x, you must first isolate x in all of the equations.
    For example for #1

    -4.7+8.6x=-29.64
    move -4.7 to the other side to isolate x
    change to positive because moving to other side
    8.6x=-29.64+4.7
    8.6x=-24.94
    divide by number infront of x to solve
    x=-24.94/8.6
    x=-2.9

    Follow the same procedure for all

    * always divide by the variable when you isolate it, for some of these you will need to expand before you can do that, but always remember to just move it to the other side, while changing the sign
    Then what would i do on the questions like # 2?
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  7. #7
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    You need to take away 2.3 from both sides, then multiply by sides by 1.5.

    This gives you y on one side, and the answer on the other!
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  8. #8
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    <br /> <br />
5.4 = \frac{y}{1.5} + 2.3<br />

    first move the 2.3 over to the other side isolated y

    <br /> <br />
5.4 - 2.3 = \frac{y}{1.5}<br />

    <br /> <br />
3.1 = \frac{y}{1.5}<br />

    then multiply both side by 1.5

    <br /> <br />
3.1 * 1.5 = y<br />

    <br /> <br />
y = 4.65<br />
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  9. #9
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    Correct! See, you can do it!

    You can put your answer into the original equation to make sure it's correct.
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