The cost to have tile installed varies directly with the size of the room ta room that is 100 square feet costs $1080 to install then how much will it cost
to have a 320 square foot room tiled?

32,000 or 345,600

Step-by-step explanation:

if you have 100 x 320  will make 32,000 if you times the 1080 with the 320 it will be 345,600 now add them together isss 377,600 btw np

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.