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umur ima = x
umur ana = y
Model matematikanya
3x - 5 = 2y ==> 3x - 2y = 5 | * 1 | 3x - 2y = 5
2x + 3 = y + 11 ==> 2x - y = 8 | * 2 | 4x - 2y = 16 --
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-x = -11
x = 11 , y = 14
Jadi, umur ima sekarang 11 tahun dan umur ana sekarang 14 tahun
kurang lebih seperti ini.....