Here it is given that the width is x ft and total length of the fence is 2400 ft .
Let the length be y ft
So we have

Let A represents area, and area is the product of length and width .
So we get

Substituting the value of y, we will get

Second part
The area is maximum at the vertex, and vertex is

And

And that's the required dimensions .
Answer:
2 x 5 = 10, 10 x 2 = 20
4 x 2 = 8, 8 x 2 = 16
5 x 4 = 20, 20 x 2 = 40
40 + 20 + 16 = 76 yd^2 is your answer.
Answer:
I'm not sure what you mean but I will solve for everything
2y = 24 - 5x
y = -(5/2)x + 12
y int. = 12
slope is -5/2
x int = 24/5
I get it now
slope int. form is y = mx + b where m is -5/2 and b is 12