Monica reads 7and1/2 pages of a mystery book in 9 minutes. what is an her average reading rate in pages per minute

It equals to about 0.83 pages per minute because in this specific problem the pages is at the bottom of the proportion (i.e. 7.5/9) and if you punch that into your calculator you get 5/6 or 0.83.

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.