Question

Can somone show/help me with this please.

Answer 1

Any specific problem?

Answer 2

Nuhuh. Just need help with all of them.

Answer 3

Well how about I go over some basic principles and I'll let you try to apply those to these problems.
First major principle. Group like terms:
3x + 2x = 3+5 Rewrite as:
5x = 8
Second major principle. Isolate x. Get x by itself:
The way to do this is to undo operations that get done to x. For example, in
5x=8
x is multiplied by 5. To undo this, I do the opposite, which is to divide by 5. Whatever I do to one side, I have to do to the other, so it looks like
(5x)/5 = 8/5
x = 8/5

Answer 4

3rd major principle:
To add or subtract two fractions, you must first get a like denominator
x/4 + x/5 = 6
(x/4) = (5x/20)
(x/5) = (4x/20)
so
(5x/20) + (4x/20) = 6
(9x/20) = 6 multiplying both sides by 20 gives
9x = 6*20 dividing both sides by 9 gives
x = 120/9

Answer 5

So for number 43: where do i start?

Answer 6

4n-(n+6) = 12-36
Start by trying to group some like terms.

Answer 7

Show me your try at that. Get all the n terms on the left and all the others grouped on the right.

Answer 8

so 5n=(-18) ?

Answer 9

I get:
4n - (n+6) = 12-36
4n - n - 6 = -24
4n - n = -18
3n = -18
So the only thing you did wrong was add 4n - n = 3n. Not 5n.

Answer 10

Do you see that?
3n = -18
And what would I do to get n by itself?

Answer 11

Oh ok, my mistake. So divide by 3? and you get n=-18/3

Answer 12

Yes =D and -18/3 = -6.

Answer 13

Oh, okay. (: So the next one, you would rewrite as -6x+9=20-4x right?

Answer 14

Yes! =D Now group like terms.

Answer 15

So you get -10x=29 then / by -10 on both sides. and you get x=29/-10

Answer 16

No hold on. How do I move -4x from the right side to the left side? I need to do the opposite of -4x to both sides.

Answer 17

so you do -6x+4x which gives me -2x=11 ?

Answer 18

Yes =)
Because to move the +9 over to the right side, I do -9 to both sides. Good. So now I'm at
-2x = 11

Answer 19

divide -2 from both sides, and i get x=- 11/2 ?

Answer 20

Yusss.