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Misalkan umur Hani adalah i.
2a - 5i = 20 |×4| 8a - 20i = 80
3a - 4i = 65 |×5| 15a - 20i = 325
-7a = -245
a = 35
Jadi umur Hana adalah 35 tahun.
Umur Hani = y
Dit : x
Jawab : 2x - 5y = 20
3x - 4y = 65
2x - 5y = 20
2x = 20 + 5y
x = 10 + 2,5y
maka,
3x - 4y = 65
3(10 + 2,5y) - 4y = 65
30 + 7,5y - 4y = 65
3,5y = 65 - 30
3,5y = 35
y = 10
x = 10 + 2,5y
x = 10 + 2,5(10)
x = 35
maka umur Hana adalah 35