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2b = a + b (sudut sehadap)
a + b - 2b = 0
a - b = 0
eleminasi
3a + 2b = 180 (x1) --> 3a + 2b = 180
a - b = 0 (x3) --> 3a - 3b = 0 _
5b = 180
b = 36°
14) x + 19 = 90 + 32
x = 90 + 32 - 19
x = 103°
15) x + 2y = 180 (berpelurus)
x = 4y (sudut sehadap)
substitusi
x + 2y = 180
4y + 2y = 180
6y = 180
y = 30°
maka
x = 4 (30)
x = 120°
semoga membantu ya :)