Question

Solve the equation Twenty-five minus four b equals negative six b plus forty-seven for b.

b equals negative eleven

b equals negative two and two tenths

b equals two and two tenths

b equals eleven

Answer 1

In standard notation, it would look like: \[\large \large 25 - 4b = -6b + 47\] What do you think you do first?

Answer 2

Subtract

Answer 3

Good. Subtract what?

Answer 4

25-4?

Answer 5

Hmm? 25 - 4b?

Answer 6

Yes but i just dont know wat the b stands for

Answer 7

Well. We want to fin db.
So we must bring the variable on one side, and the number on the other side.
So what can we subtract?

Answer 8

25-b4?

Answer 9

Nope. I'll give you a headstart. You want to subtract 25 on both side. So what does that give you?

Answer 10

0

Answer 11

47-25= ?

Answer 12

22

Answer 13

Good. And 25 - 25 = 0.
So your equation should look like: \[\large \large -4b =-6b + 22\]

Answer 14

Now, what do you think you do next?

Answer 15

Add

Answer 16

Add what?

Answer 17

46+22

Answer 18

Where did you get 46 from?

Answer 19

Tip: We want to bring -6b to the left. How can we do that?

Answer 20

I think by putting 4b to the right

Answer 21

We want to do something to both side that has the same value. If we did something to both side that wasn't equal, then it wouldn't be an equation.

To bring -6b to the left, you want to add both side by 6b. What do you get?

Answer 22

-6b + 6b = ?

Answer 23

Ok but the problem im having id the letters like i dont know how to add or subtract the letters with the numbers

Answer 24

is*

Answer 25

What do you mean?
Give me an example.
Like 10x + 2x = ?

Answer 26

Like n=-1

Answer 27

If it's like n = -1.
Then you can't do anything more. Since you already find your variable.

Do you mean the original problem you had?

Answer 28

yess

Answer 29

Well. You want to bring the variable on one side, and the number on the other side.
So if you have for example:
10 + 2x = 4x + 5
You would want to bring the variable on one side. So let say we want to bring 2x to the right. We would want to subtract both side by 2x .

10 + 2x - 2x = 10.
4x - 2x + 5 = 2x + 5

Does it make sense?

If my teaching doesn't make sense, then click here: http://www.onlinemathlearning.com/equations-variables-both-sides.html

Answer 30

^Example on how you should solve that example. Make sense?