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9x = 180˚ -------> x = 180/9 = 20˚
● 2y = 5x
2y = 5.20˚
2y = 100˚ --------> y = 100/2 = 50˚
jadi, nilai x dan y = 20˚ dan 50˚ (B)
4x+5x = 180
9x = 180
x = 180/9
x = 20°
Sudut-sudut yang berhadapan adalah sama besar, maka
2y = 5x
2y = 5.20
2y = 100
y = 100/2
y = 50°
jawaban 20° dan 50° (b)