You want to fence a rectangular area for kids in the

backyard. To save on fences, you will use the back

of your house as one of the four sides. Find the

possible dimensions if the house is 60 feet wide and

you want to use at least 160 feet of fencing.

Fencing = finding perimeter

Perimeter = Length + Length + width + width

But you are using one of the side of the house, i, e, width at one side doesnt need fencing.

L + L + 60 ≥ 160

2L + 60 ≥ 160

2L ≥ 160 - 60

2L ≥ 100

L ≥ 50

The length must be at least 50 feet long