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maka,
(2x - x) - (3y - 3y) = 6500 - 4000
x = 2500
substitusi nilai x ke
x + 3y = 4000
2500 + 3y = 4000
3y = 4000 - 2500
3y = 1500
y = 1500/3
y = 500
jadi 4x + 4y = 4 x 2500 + 4 x 500
= 10000 + 2000
= 12000
1pulpen dan 3 pensil = 4.000
6.500-4.000 = 2.500 (harga 1 pulpen)
2pulpen *2.500 = 5.000
6.500-5.000= 1.500 (3pensil)
1.500 : 3 pensil = 500 (1 pensil)
Jadi, jika 4 pensil dan 4 pulpen yaitu :
2.500*4 = 10.000
500*4 = 2.000
10.000+2.000 = 12.000