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pulpen=3.000
4.000+(3000×3)=13.000
(4.000×2)+(3.000×5)=23.000
x+3y = 13000
2x+5y = 23000
samakan dengan dikali 2 dan 1 untuk menyamakan x
2x+6y = 26000
2x+5y = 23000
y = 3000
x+3y = 13000
x+(3*3000) = 13000
x+9000 = 13000
x = 13000-9000
x = 4000
jadi harga pulpen adalah 3000
y = 5000