Trying to make honor roll <me out

which equation has exactly one solution

a. n - 2n + 1 = 2n - 3n - 1
b. 2n - n = 2n - 3n
c. 1 - n - 2n = 1 - 2n - n
d. n - (1 - 2n) = 2n + (n - 1)

answer is b i think

Step-by-step explanation:

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!