Question

Cindy has 30 meters of fencing. She plans to fence a rectangular dog run that is 4 meters wide. How long can the run be made?

Answer 1

perimeter = L + L + w + w
P=2L + 2w

Answer 2

30 meters of fencing so our perimeter can be 30
our equation is the:
30 = 2L + 2(4)
30 = 2L + 8 now we subtract 8 from both sides
30 - 8 = 2L + 8-8
22 = 2L and dived both sides by 2
22/2 = 2L/2
11=L

do a check
30 = 11 + 11 + 4 + 4