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19-11-2018
Mathematics

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the length of a rectangle is 6 meters longer than the width. The perimeter is 42 meters. What is the width?

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19-11-2018

perimiter=2(L+W)=42

42=2(L+W)

divide by 2

21=L+W

length is 6 longer than width

L=6+W

subsituet

21=L+W

21=(6+W)+W

21=6+2W

minus 6 both sides

15=2W

7.5=W

width is 7.5 meters

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