it is a arithmetic sequence
5(2y-4) - 3y = 1. 10y-20-3y=1. 7y-20=1. 7y=21. y =3. x = 2(3)-4. x = 2. x*y =6.

1st step you subtract 7 from both sides and the 7 get cancelled so you will get

2nd step you divide by 10 from both sides so you will get

3rd step is that you final answer is
5 students used 1/8 each
5 · 1/8 = 5/8
Subtract 5/8 from 2 3/4 to get your answer
First, make it the same denominator: 8
2 3/4 = 2 6/8
2 6/8 - 5/8 = 2 1/8
There is about 2 yarn left. Exact amount left: 2 1/8
Hope this helps :)
4) Fraction: 56/100
Dollar: $0.56
Decimal: .56
6) Fraction:41/100
Decimal: 41%