SOLUTION: I am sorry but I am trying to help my son figure this out and just don't get it. Below you will find the problem. Please walk me through how to solve this problem, step by step so

Click here to see ALL problems on Linear-systems

Question 7545: I am sorry but I am trying to help my son figure this out and just don't get it. Below you will find the problem. Please walk me through how to solve this problem, step by step so that I may help him.
I have 5 problems just like this
Thank you,
4(Sn-7)=10n+2
Answer by bonster(299) (Show Source):
You can put this solution on YOUR website!
Can you verify that the problem was written correctly?
You wrote: 4(Sn-7)=10n+2
Is it possibly: 4(5n-7)=10n+2?
If so, this is what you'd do:

1) Look at the first part "4(5n-7)"
you need to multiply 4 to both "5n" and to "-7"
(5n)(4)-(7)(4)

2) put it back into the equation:
4(5n-7)=10n+2
(5n)(4)-(7)(4)=10n+2
20n-28=10n+2

3) Subtract 10n from both sides to isolate +2
(20n-28)-10n=(10n+2)-10n
10n-28=2

4)add 28 to both sides to isolate 10n
(10n-28)+28=(2)+28
10n=30

5) divide both sides by 10 to isolate n
=
n=3