jawab donk yg bisa,susah nih

6) 6/9 =8/8+y
=> 2/3 = 8/8+y
=> 8+y = 8 x 2/3
=> 8+y = (8x3/2x1)
=> 8+y =24/2
=> 8+y = 12
=> y= 12-8
=> y= 4