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

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