Please bantu jawaabb dgn cara kerjanya

#27
5x = 3x + 8
5x - 3x = 8
2x = 8
x = 4

Panjang diagonal:
= 5x
= 5 × 4
= 20 cm

#28
Total semua sudut 360°
Total sudut yang berdekatan 180°

100° + 2x = 180°
2x = 180° - 100°
2x = 80°
x = 40°

100° + (y + 15°) = 180°
y = 180° - 100° - 15°
y = 65°

x + y = 40° + 65° = 105°

Jadikan terbaik ya, makasih banyak kakakkk