Question 847505
2y = x+2

2x+1 = x+y+2

2x+1 = y+(x+2)

2x+1 = 3y

x+2 = 2y
2x+1 =3y

Multiply top by 2.


2x+4 = 4y
2x+1 = 3y
---------
   3=  y

x+2 = 2*3

x = 4

1st side:  6 cm
2nd side:  9 cm 
3rd side:  6 cm
4th side:  9 cm

Perimeter: 6+9+6+9 = 30 cm