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.

Re: Eight Grade Math Honors Help - Please Help!

1. Subtract 9 from both sides of the equation:

$\displaystyle 5x = -7$

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

2. is done the same way.

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

4. Expand both sides to get $\displaystyle 70 - 21w = 75 - 60w$. Bring all the $\displaystyle w$ terms to one side, solve for $\displaystyle w$.

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.

Re: Eight Grade Math Honors Help - Please Help!

Quote:

Originally Posted by

**AbhiKap** 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?)

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.

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.

Re: Eight Grade Math Honors Help - Please Help!

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