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# The width of a house must be 48 feet, but the length (l) can change.what happens to the perimeter (P) of the house when the length changes?

The width of a house must be 48 feet, but the length (l) can change.what happens to the perimeter (P) of the house when the length changes?

### 3 Answers by Expert Tutors

Michael F. | Mathematics TutorMathematics Tutor
4.7 4.7 (7 lesson ratings) (7)
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The perimeter of the house is always P=2×48+2×length.  We start with length = l
If l changes from l to l+Δl then  the perimeter changes from P to P+2Δl
Feel free to make Δl positive or negative or even zero
Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
3.0 3.0 (1 lesson ratings) (1)
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Hi Theresa;
Perimeter=(twice length)+(twice width)
In the house enlarges...
Perimeter change=(twice new length)-(48 feet)
If the house shrinks...
Perimeter change=(48 feet)-(twice new length)

Ralph L. | Algebra I, II, Visual Basic, Beginning C++ tutorAlgebra I, II, Visual Basic, Beginning C...
4.0 4.0 (1 lesson ratings) (1)
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Depends. If you increase length from the original length, the perimeter will increase. If you decrease length from the original length, the perimeter will decrease.