A rectangle has a perimeter of 12m. if each side is a whole number of meters, what are the possible dimensions for the length and width? List them and please explain your answer.
P = 2L + 2W
12 = 2(2) + 2(4)
12 = 2(1) + 2(5)
12 = 2(2) + 2(4)
12 = 2(1) + 2(5)