The equation that best models the situation is; 2(8 + L) = 40.
<h3>How to find the perimeter of a rectangle?</h3>
We are told that;
Vijay is building a new rectangular enclosure.
Amount of fencing material Vijay has = 40 ft
The width of the enclosure = 8 feet.
Now, we are told that l is the length of the enclosure, and Vijay uses all of the fencing material.
This means that there are two width and two length sides.
Therefore, if you want the fencing to equal 40 feet around the perimeter, (8 · 2 + L · 2) = 40.
Factoring 2 out gives us;
2(8 + L) = 40.
Read more about perimeter of a rectangle at; brainly.com/question/24571594
#SPJ1