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3 :1 , koefisiennya a aja jadi 3a :a
1. 90'= 2y + x
90 = 2.a + 1.3a
90 = 5a
18= a
ingat x : y
3a : a
jadi y = 18
x = 3.18 = 54
hasilnya = x = 54 dan y = 18
2. aob = x + (2y x 3)
= 54 + (2.18 x 3)
= 54 + 108
= 162'
maaf kalo salah dan membingungkan