tolong jawab no 1 dan 2

Bab Kesebangunan
Matematika SMP Kelas VIII

1] AB/BC = AE/CD
    6/9 = 12/x
    x = 12 x 9 / 6
    x = 18 

   ED = 2
   BE / BD = AB/BC
   y/(y + 2) = 6/9
   9y = 6 (y + 2)
   9y = 6y + 12
   9y - 6y = 12
   3y = 12
   y = 12/3
   y =4

2] IH / FG =IJ / FJ
    
   20 / 30 = x / 18
   x = 18 x 20 / 30
   x = 12

   HJ / GJ = IH / FG
   y / (y + 2) = 20 / 30
   30y = 20 (y + 2)
    30y = 20y + 40
   30y - 20y = 40
   10y = 40
    y = 40/10
    y = 4