The area of a region was 125,000 square feet. A type of fencing costing \$20 per foot was used along the back and front, and a less expensive fence costing \$10 was used for the other sides. What were the dimensions of the region that minimized the cost of the fence?
I am not sure where to start with this question, my class has not done anything like this before.I started the equation with the function $$ C=20(2x)+10(2y) $$ And then I used substitution to get $$ C=40x+2500000/x $$ I am not sure how to solve this problem. I looked up an example problem similar; however, they used calculus to solve this and I am only in algebra. Does anyone know how to solve this without calculus?