Question 104383
The length of a rectangle is 9 centimeters more than it's width.
This says: L = (W+9)
:
 The perimeter is 82 centimeters. 
you know: 2L + 2W = 82
;
Substitute (W+9) for L, and find W:
2(W+9) + 2W = 82
:
Simplify, divide equation by 2 and you have:
W + 9 + W = 41
2W  = 41 - 9
2W  = 32
W = 32/2
W = 16 is the width
:
It said the length was 9 cm more: L = 25 cm
:
:
Check the perimeter now
2(25) + 2(16) = 82