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jaket = x
topi = y
4x + 5y = 600.000 (pers.1)
3x + 2y = 380.000 (pers.2)
x + 3y = ?
pers.1 dikali 2
pers. 2 dikali 5
sehingga
8x + 10y = 1.200.000
15x + 10y = 1.900.000
dikurangi
-7x = -700.000
x= 100.000
disub ke pers 1
4 x 100.000 + 5y = 600.000
400.000 + 5y = 600.000
5y = 200.000
y = 40.000
x + 3y
= 100.000 + 3x40.000
=100.000 + 120.000
= 220.000