A. 35°B. 40°C. 75°D. 110°​

Mencari nilai y

Sudut lurus totalnya 180°

80° + 3y-5° = 180°

75° + 3y = 180°

3y = 180° – 75°

3y = 105°

y = 105°/3 = 35°

Mencari nilai x

x + 5 = 80°

x = 80° – 5°

x = 75°

Jadi, x – y = 75° – 35° = 40°

》Garis dan Sudut

Nilai y =

3y – 5° = 100°

3y = 100° + 5°

• y = 105° ÷ 3
• y = 35°

Nilai x =

x + 5° = 80°

• x = 80° – 5°
• x = 75°

Nilai x – y =

• = 75° – 35°
• = 40°

《 OPSI B 》