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x = 4y
a. masukkan/substitusi x = 4y ke x + y = 180 :
x + y = 180
4y + y = 180
5y = 180
y = 180/5
y = 36 (sudut yang kecil)
b. 4y = 4 x y = 4 x 36 = 144 (sudut yang besar)