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20+10=4x-3x
30=x
4x-10=4x30-10=110
y=180-110=70
⇒ 4x - 3x = 20 + 10
⇒ x = 30°
maka
(4x - 10) + y = 180 (berpelurus)
⇒ 4(30) - 10 + y = 180
⇒ 120 - 10 + y = 180
⇒ 110 + y = 180
⇒ y = 180 - 110
⇒ y = 70°
Jawab : C
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