Question 758189
Rectangle B's perimeter = 2*length + 2*width
                        = 2(x - 1) + 2(5)
                        = 2x + 8
Rectangle B's perimeter = Rectangle A's perimeter
                 2x + 8 = 6x + 2
Collect like terms.
                 -4x = -6
                   x = 3/2cm
Proof:
       2x + 8 = 6x + 2
       2(3/2) + 8 = 6(3/2) + 2
                11 = 11
Hope this helps.
:-)