Question 418109
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Hi
Let x and (x+ 9cm) respresent the width and length respectively
  2(x+9) + 2x = 50cm  
       4x = 32
       x = 8cm, the width.  The length is 17cm   (8cm + 9cm)
CHECKING our Answer***
 2*17cm + 2*8cm  = 50cm
<img src="http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/PerimeterRectangle.svg/200px-PerimeterRectangle.svg.png">