Tallyn bought 4 pairs of shoes for 8$ a pair and spent 12$ on a video game. he paid for the shoes and video game using his debit card . the chang in the balance of serena's checking account can be represented by the expereshions shown

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.