Question

HELP again...

9+4(x+1)=25

Answer 1

What do think is the first step here?

Answer 2

If I were you I'd subtract 9 for each side.

Answer 3

...which gives you

4(x+1) = 25 - 9 = 16

So

4(x+1) = 16

Now what?

Answer 4

I'm not sure. This is tomorrow's homework, and I am not going to be in class. So I have no clue?

Answer 5

Well, if I told you

4y = 12

How would you find y?

Answer 6

you would divided 4/4 then 12/4 and that comes out to 3

Answer 7

Right.

So look now again at

4(x+1) = 16

Answer 8

how did you get that? where did the 9 go?

Answer 9

I started with your equation

9 + 4(x+1) = 25

and the first step was subtracting 9 from each side, as I wrote above

-9 + 9 + 4(x+1) = -9 + 25

0 + 4(x+1) = 25 - 9 = 16

i.e., 4(x+1) = 16

Answer 10

oh ok. I think I understand. So how did you get that into this equation? 4(x+1) = 16

Answer 11

Sorry, are you asking (1) how I got to the equation

4(x+1) = 16

or (2) how now you solve this equation?

The answer to number (1) are the steps I just wrote down.

Answer 12

I think I know how to it. thanks :)

Answer 13

now 30 more equations like this left. thanks again.

Answer 14

What answer did you get?

Answer 15

To 4(x+1) = 16. I got x=3

Answer 16

Exactly. Great.

Answer 17

now just 30 more equations. thank you :)

Answer 18

one last question on this one equation 7(d-5)+12=5.

So would I do 7-7(d-5)+12-7=5-7?

Answer 19

No.

First step: subtract 12 from both sides

Answer 20

So.


-5(d-5)=5

Answer 21

7(d-5) + 12 = 5
7(d-5) + 12 - 12 = 5 - 12
7(d-5) + 0 = -7

That is,

7(d-5) = -7

Answer 22

what now do I do? I tried to find the one we did earlier but I can not locate it.

Answer 23

Now divide both sides by 7
\[\frac{7(d-5)}{7} = \frac{-7}{7}\]
Cancel 7s throughout and

d - 5 = -1

Answer 24

d=-6? but then when I see if I am correct I come out with (-6-5)=-11?

Answer 25

Noooo ..... now add 5 to both sides

Answer 26

(d)=4?

Answer 27

(d-0)=4?

Answer 28

d - 5 = -1
d - 5 + 5 = -1 + 5
d + 0 = 4

Answer 29

Yep, d = 4

Answer 30

I'm so lost. I totally guessed with 4.

Answer 31

Go back over these two examples and try and understand them. Copy out my steps.

Then take a blank piece of paper and do it again. When you can do it without looking at this site or your previous version, then you understand them.

When you understand these two problems, your other 28 problems will be much easier.