Question 764787
Length = x
Width = y
Perimeter = 2x + 2y 
       
2x + 2y = 62
 x + 2y = 42
Subtract
 x      = 20
Substitute x = 20
into x + 2y = 42
    20 + 2y = 42
         2y = 42 - 20
         2y = 22
          y = 11
Length = 20cm
Width = 11cm
Hope this helps.
:-)