Answer:
width = 3 feet
Explanation:
The width of a rectangle is 3 feet less than its length.
Let L be the length of the rectangle
Width is 3 feet less than its length
so width is length - 3
Width = L - 3
given perimeter = 18 feet
Perimeter of rectangle = 2(length ) + 2(width)
18 = 2L + 2(L-3)
18 = 2 L + 2L - 6
Add 6 on both sides
24= 4L
divide by 4 on both sides
L = 6
Length = 6 feet
Width = L - 3= 6 -3 = 3 feet