17 dan 18 tolong dibantu pakai cara, makasih.

17. 6x+5y = 11.200×6
8x+6y= 14.400×5


18.keliling = 30cm × 2 = 60 cm
25 cm × 2 = 50 cm
10 cm × 2 = 20 cm
.......................................................+
130 cm
jawaban pilihan B

say thanks ;)