Emma is 9-14 year old how many months old is she

9 years equals 108 months old.

14 years equals 168 months old.

the answers is in between 108-168 months old 

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.