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4y = 108°
y = 27°
Besar sudut pada segiempat adalah 360°
108° + 108° + 3x + 3x = 360°
216° + 6x = 360°
6x = 360° - 216°
6x = 144°
x = 24°
2x + y = 2(24°) + 27°
= 48° + 27°
= 75°
y = 108/4 =27 jadi 2x + y= 2 (24) + 27
= 48 + 27
=75
karena 3x + 4y= 180
3x + 4(27)=180
3x+ 108 =180
3x=180-108
x=72/3
=24