tolong kak pakai caranya

x + 5y = 60° (karena bertolak belakang)

12x + (x + 5y) = 180° (karena berpelurus)
12x + 60° = 180°
12x = 180° - 60°
12x = 120°
x = 120°/12
x = 10°
x + 5y = 60°
10° + 5y = 60°
5y = 60° - 10°
5y = 50°
y = 50°/5
y = 10°