Please help! I don't understand this at all!
1. Lin wants to know how many games teenagers in the United States have on their phones.
What is the population for Lin's question?
2. Lin wants to know how many games teenagers in the United States have on their phones.
Explain why collecting data for this population would be difficult.
3. Lin wants to know how many games teenagers in the United States have on their phones.
Give an example of a sample Lin could use to help answer her question.

1. All the teenagers in the U.S.

2. He can only be in one place at a time and even then gathering all the data would take too long and with such a large population there would be too much room for error

3. Instead he could do his grade/lunch/class.

check above link.

graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.