bryant22
Apr 11, 2011, 02:10 PM
IF I need 50,000 sq feet of fence and the fancy fence(x) along the road is $20 per linear foot and the fence on the other 3 sides is $5 per foot. Find a function for the cost of the fence in terms of x
Unknown008
Apr 12, 2011, 11:03 AM
I'm supposing that the area to be fenced is rectangular/square.
Let x be the side along the road and y be the side next to the side x.
The area is given by xy and 50000 = xy.
The cost of the fence on the x side is 20x.
The cost of the fence on the other sides is 5y + 5y + 5x
The total cost (cost function in terms of x and y) is 20x + 5y + 5y + 5x
Substitute y by x to get the cost function in terms of x only.