A recipe for making 54 biscuits requires 9 cups of biscuit mix. Using this recipe, how many cups of biscuit mix will be needed to make 18 biscuits?
A. 2 cups
B. 3 cups
C. 4 cups
D. 6 cups

power property.

goog may have it for you

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.