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misal:
buku= X
penggaris= y
3x + 5y = 14.500
2x + 3y = 9.000
dit: x + y = ...
jawab:
3x + 5y = 14.500 | ×2 | 6x + 10y = 29.000
2x + 3y = 9.000 | ×3 | 6x + 9y = 27.000
_______________________________-
y= 2.000
2x + 3y = 9.000
2x + 3(2.000) = 9.000
2x + 6.000 = 9.000
2x = 9.000 - 6.000
2x = 3.000
x = 3.000 ÷ 2
x= 1.500
jadi, x + y = 1.500+2.000
=3.500