Can you help me with these equations?

2008-06-08 5:31 pm
I've been at them for ages >.<

1. 6x + 11 = -109 - 9x
2. -126 - 8x = 10x + 18
3. 7 - 10x = 192 - 45x
4. 223 - 6x = 30x + 15

Thank you :)
更新1:

lol, thank you Trevor :D

回答 (14)

2008-06-08 5:40 pm
✔ 最佳答案
6x + 11 = -109 - 9x
6x + 9x = -109 - 11
15x = -120
x = -120/15
x = -8

-126 - 8x = 10x + 18
-8x - 10x = 18 + 126
-18x = 144
x = 144/(-18)
x = -8

7 - 10x = 192 - 45x
-10x + 45x = 192 - 7
35x = 185
x = 185/35
x = 37/7

223 - 6x = 30x + 15
-6x - 30x = 15 - 223
-36x = -208
x = -208/(-36)
x = 52/9
2008-06-09 1:06 am
1st question:
6x + 11 = - 109 - 9x
15x = - 120
x = - 8

2nd question:
- 126 - 8x = 10x + 18
18x = - 144
x = - 8

3rd question:
7 - 10x = 192 - 45x
35x = 185
x = 37/7

4th question:
223 - 6x = 30x + 15
36x = 208
9x = 52
x = 52/9
2008-06-09 12:40 am
the following is just the way I decided i wanted to do it

( sorry Only have time to help with one) subtract 6x from both sides and you get -15x
then add 109 to both sides and you end up getting 120=-15x (the 109 cancels out)
next divide -15x by -15 and 120 divided by -15 and you get

-8 as x
2008-06-09 12:37 am
15x=-120
x=-120/15=-8

18x=-144
x=-8

35x=185
x=37/7

36x= 208
x = 52/9
2008-06-09 12:36 am
6x+11=109-9x
So this becomes
6x+9x = 109-11
Notice that -9x becomes +9x because you took it to the other side of the equal sign. Its the same reason for +11 to -11
Anyways,
6x+9x=109-11 This becomes 15x=98
x - 98/15
Enjoy
2008-06-09 12:35 am
I dont feel like doing all of them so ill do 1 haha
6x + 11 = -109 -9x
-6x +109 +109 -6x
120 = -15x
/-15 /-15
-8 = x
2008-06-10 3:07 pm
Question 1
15x = - 120
x = - 8

Question 2
- 144 = 18x
- 24 = 3x
x = - 8

Question 3
35x = 185
7x = 37
x = 37/7

Question 4
208 = 36x
52 = 9x
x = 52/9
2008-06-09 12:50 am
1)
6x + 11 = -109 - 9x
6x + 9x = -109 - 11
15x = -120
x = -120/15
x = -8

2)
-126 - 8x = 10x + 18
-10x - 8x = 126 + 18
-18x = 144
x = 144/-18
x = -8

3)
7 - 10x = 192 - 45x
45x - 10x = 192 - 7
35x = 185
x = 185/35
x = 37/7

4)
223 - 6x = 30x + 15
-30x - 6x = -223 + 15
-36x = -208
x = -208/-36
x = 208/36
x = 52/9
2008-06-09 12:45 am
The best method for this type of equation is rearranging the thing until it makes more sense. So, for example, with the first one:

6x + 11 = -109 - 9x is pretty gruesome. If you add 9x to both sides, you can get rid of that nasty -9x to give you a positive integer.

Now you have 15x + 11 = -109. If you take away 11 from the left side, you're left with 15 x = -109.

The final step is to divide the whole thing by 15 to give you a single sum of x. So -109/15 = -7.26 ish.

Therefore, x = -7.26.

Hope that helped.
2008-06-09 12:42 am
In each case you have to collect all the x terms one side of the equation and all the non x terms (that is just the numbers) the other. Follow each of the steps below and you will soon see how yhis is done. Don't be surprised that x sometimes = a negative number and sometimes is not a whole number.


6x + 11 = -109 - 9x
6x + 9x = -109 - 11
15x = -120
x = -120/15
x = -8

-126 - 8x = 10x +18
-126 - 18 = 10x + 8x
-144 = 18x
x = -144/18
x = -8

7 -10x = 192 - 45x
-10x + 45x = 192 - 7
35x = 185
x = 185/35
x = 37/7
x = 5 2/7

233-6x = 30x + 15
233 - 15 = 30x +6x
218 = 36x
x = 218/36
x = 6 1/18


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