Mary wants to fill in a cylinder vase. at the flower store they told her that the vase should be filled for the flowers to last the longest. her cylinder vase has a radius of 2 in and a height of 9 in. how much water should mary pour into the vase?

The question is asking for the volume of the cylinder

V = π·r²·h

V = π·2²·9

V = π·4·9

V = 36π

30 people weigh 160 pounds or more

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.