Help me plz this is my worst subject.

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.

i think its a.

hope this

the answer is a) a healthy economy because it results from a steady rise in demand.