bantu jawab pake cara

nomer 4
bagian a
90 - p = 4/13 ( 180 - p)
90 - p = 720/13 - 4/13p (kalikan dengan 13)
1170 - 13p = 720 - 4p
-13p + 4p = 720 - 1170
-9p = -450
p = 50 derajat
bagian b
(180 - 50) - 50 = 80 derajat

nomer 5
pers 1 : 2y = x
pers 2 : x + 3x + 2y = 180
4x + 2y = 180
4x + x = 180
5x = 180
x = 36

y =36/2 = 18

x - y
36 - 18 = 18