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umur ayu = b
maka persamaannya menjadi:
(a-2) = 6(b-2)
a - 2 = 6b - 12
a - 6b = -10...(1)
a+18 = 2(b+18)
a + 18 = 2b + 36
a - 2b = 18...(2)
eliminasi a
a - 6b = -10
a - 2b = 18
----------------- -
- 4b = - 28
b = 7
a - 2(7) = 18
a -14 = 18
a = 32
maka
umur ayah 32 tahun
umur ayu 7 tahun