PLEASE I need to understand these, I have tried but I really don't get it, if someone could give me at least the answer that would be amazing ♡ 1) the national honor society is selling tickets for the spring dance, tickets are 12$ for couples and 8$ for singles. Let x be the number of couples and y be the number of singles. This system of equations represents the situation in which ticket sales totaled $1,580 and a total of 250 students attended the dance:

12x + 8y = 1,580
2x + y = 250
How many single tickets were sold?

- 14
- 40
- 105
- 133

2) What is the sum of the values of x and y that solves this system of equations?
2x - y = 3
4x + 3y = 11

- 1
- 1.2
- 3
- 4.5

3) Lynette is participating in a stock market activity in economics class. She selected two stocks and followed their performance each week for x weeks. She purchased 25 shares of a technology stock for $1.50 per share. The technology stock rose in total by $2 per week. She also purchased 25 shares ot a transportation stock for $0.50 per share. The transportation stock fell in a total by $0.10 per week.

Select the system of linear equations that represents Lynette's stock market experience if f(x) represents the value of the technology stock and g(x) represents the value of transportation stock after x weeks.

- f(x) = 2x + 25
g(x) = -0.1x + 25

- f(x) = 2x + 37.5
g(x) = -0.1x + 12.5

- f(x) = 2x + 37.5
g(x) = -0.1x - 12.5

- f(x)= 2x + 1.5
g(x) = -0.1x + 0.5

please help :(