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papan jepit = x
pensil = y
4x +8y = 80.000
3x +10y = 70.000
Metode eliminasi :
4x +8y = 80.000 Ι x3 Ι 12x +24y = 240.000
3x +10y = 70.000 Ι x4 Ι 12x +40y = 280.000 -
-16y = -40.000
y = 2500
4x +8y = 80.000 Ι x10 Ι 40x +80y = 800.000
3x +10y = 70.000 Ι x8 Ι 24x +80y = 560.000 -
16x = 240.000
x = 15000
Jadi, harga 1 pensil adalah 2500.
Itu jawabannya.