Tolong jawab plisssss

8) sudut berpelurus  = 180°
    (3y - 15) + (4y) + (2y - 9)  = 180°
     9y - 24 = 180°
           9y  = 180° + 24°
             y  = 204/9
                 = 22,6°

9) sudut segitiga = 180°
    6x + 3x + x      = 180°
                    10x  = 180°
                        x  =  180 / 10
                            = 18°

 ∠A = 3x
       = 3 (18°)
       = 54°
 ∠B = x = 18°
 ∠C = 6x
       = 6(18°)
       = 108°