Can someone help with two math problems?

Question

I need help with these i know how to but then i get stuck so here


1. 7n-11=2n-9

And

2.6=-2(10n=7)

Answer 1

1)

7n - 11 = 2n - 9
7n - 11 +11 = 2n - 9 + 11
7n = 2n +2
7n - 2n = 2n - 2n + 2
5n = 2
n = 2/5

2)

I'm assuming it's supposed to say...

6 = -2(10n+7)
6 = -20n - 14
6 + 14 = -20n -14 + 14
20 = -20n
n = -1

Answer 2

1) 7n-11 = 2n-9

First get the n's on the same side by subtracting 2n from both sides:
7n-11-2n = 2n-9-2n
5n-11 = -9

Then add 11 to both sides:
5n-11+11 = -9 +11
5n = 2

Then divide both sides by 5:
5n/5 = 2/5
n = 2/5 or 0.4

2) I am assuming you meant 6 = -2(10n+7)
First expand the parentheses:
6 = -2 x 10n + -2 x 7
6 = -20n -14

Then add 14 to both sides:
6 + 14 = -20n - 14 + 14
20 = -20n

Then divide both sides by -20
20/-20 = -20n/-20
-1 = n

Answer 3

1. 7n-11=2n-9
7n-2n = 11-9
5n =2
n=2/5


2.6=-2(10n+7)
2.6 = -20n -14
20n = -14-2.6
20n = -16.6
n = - .83

Answer 4

Hi,

For the first one, the first thing you need to do is move the 2n to the left side to get:

5n - 11 = -9

Now add 11 to both sides

5n = 2

Now divide by 5 and get n = 2 / 5.

For the second question: you need to do the following steps:

2.6 = -20n - 14

16.6 = -20n

0.83 = n

I hope that helps you out! Let me know if you have any other questions!

Sincerely,

Andrew

Answer 5

1 is -2=n


-9-11 = 2n+7n
-18 = 9n
-18/9 = 9n/9
-2 = n

i have no clue about the second one

Answer 6

You typed in your second equation wrong. I can't believe you don't know how to do these, by the way.

1. n = 2/5 = 0.4

For the 2nd one, I'm going to assume the = is a plus in the paranthesis because they're on the same key.

2. n = -1

Answer 7

7n-11=2n-9
7n-2n=9+11
5n=20
*n=4*

2.6=2(10n-7)
2.6=20n-14
16.6=20n
*n=0.83*