A rectangular water trough at a fish hatchery measures 4 feet wide, 9 feet long, and 6 feet deep. If the trough is filled to the top, how many water can it hold?

answer:

c. the third graph

its c or d   take a lucky guess my dude

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.