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Math Help - Eight Grade Math Honors Help - Please Help!

  1. #1
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    Eight Grade Math Honors Help - Please Help!

    Hello,

    I am in eight grade Math Honors and I would like some help on the following questions:

    1. 5x + 9 = 2
    2. 7 - 6d = 3
    3. 1/3y - 2 = 4
    4. 7 (10-3w) = 5(15 -4w)

    This may look easy for you guys, but I don't have a lot of time and I don't know which place to post this.
    But PLEASE PLEASE HELP! Can you explain how to do it? Please don't just give the answers, I need to know how to solve it.

    Thanks, Help is appreciated.
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  2. #2
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    Re: Eight Grade Math Honors Help - Please Help!

    1. Subtract 9 from both sides of the equation:

    5x = -7

    Divide both sides by 5 to get x = -\frac{7}{5}.

    2. is done the same way.

    3. is a little unclear -- do you mean \frac{1}{3y} - 2 = 4 or \frac{1}{3y-2} = 4?

    4. Expand both sides to get 70 - 21w = 75 - 60w. Bring all the w terms to one side, solve for w.
    Last edited by richard1234; August 8th 2012 at 11:20 AM.
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  3. #3
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    Re: Eight Grade Math Honors Help - Please Help!

    Thanks. For the second one, if it is done the same way as the first one, would the answer be: D = -4/6? Also, the third one is the first one on your post. 1/3y - 2 = 4, and the two is not under the one.
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  4. #4
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    Re: Eight Grade Math Honors Help - Please Help!

    Quote Originally Posted by AbhiKap View Post
    Thanks. For the second one, if it is done the same way as the first one, would the answer be: D = -4/6? Also, the third one is the first one on your post. 1/3y - 2 = 4, and the two is not under the one.
    no, that is incorrect on the second one. you should always check your work:

    if d = -4/6, then:

    7 - 6d = 7 - 6(-4/6) = 7 + 4 = 11, which is not 3.

    i would proceed as follows (since you appear to have trouble with "signs"):

    7 - 6d = 3
    7 - 6d + 6d = 3 + 6d
    7 + 0 = 3 + 6d
    7 = 3 + 6d
    7 = 6d + 3
    7 - 3 = 6d + 3 - 3

    ...can you continue?

    by the way, this *is* the wrong section, this is "pre-college algebra" not "college algebra" (as you might have guessed from being in the 8th grade, which is not college, hmm?)
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  5. #5
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    Re: Eight Grade Math Honors Help - Please Help!

    Yeah, second one's not -4/6. Apparently you put this in the "advanced algebra" forum. Algebra can be waaaay more abstract than what you're learning right now.
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  6. #6
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    Re: Eight Grade Math Honors Help - Please Help!

    As mentioned before, I am aware of the fact that this is in the wrong section. However, the reason I put it here is because I couldn't find a Super Basic Algebra section, if there is one.
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  7. #7
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    Re: Eight Grade Math Honors Help - Please Help!

    Deveno, I don't get your last steps, can you explain them please?
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