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Bilangan I = a dan,
Bilangan II = b
Maka,
a + b = 23 .... Pers. 1
a - b = 7 .... Pers. 2
Tambahkan pers 1 dengan pers 2
a + b + a - b = 23 + 7
2a = 30
a = 15
Masukkan a tsb ke dalam pers. 1
15 + b = 23
b = 8
Hp : { 15 , 8 }
a = 23 - b
a - b = 7
23- b - b = 7
-2b = -16
b= 8
a = 23-8 = 15
bil. itu 15 dan 8