The owner of a store buys wooden benches for $50 each. She marks up the price by 75%. At the end of the season, she sells the remaining benches for
30% off. How much profit does the owner make on each bench at the end of
che season? Show your work.

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.

1) 2/5

2) zero=0/1

3) zero=0/2

4) -4/5

5) undefined=3/0