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3x + 120⁰ = 180⁰
3x = 60⁰
x = 20⁰
x + 80⁰ +y = 180⁰ (karena sudut berpelurus)
20⁰ + 80⁰ + y = 180⁰
y = 180⁰⁰ - 100⁰
y = 80⁰
d. x = 180⁰ - 102⁰
= 78⁰
e. * 5x + 80° = 180°
5x = 100°
x = 20°
* 5x + 7y = 180° ( karena berpelurus)
5(20) +7y = 180°
100° + 7y = 180°
7y = 80°
y = 80/7°