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x = pensil
y = buku
didapat persamaan sbb:
12x+8y = 70.000 |x1| 12x+8y = 70.000
9x+4y = 42.500 |x2| 18x+8y = 85.000
________________ -
-6x = -15.000
x = 15.000/6
x = 2.500
maka :
12x+8y = 70.000
12(2.500)+8y = 70.000
30.000+8y = 70.000
8y = 70.000 - 30.000
8y = 40.000
y = 40.000/8
y = 5.000
jadi, harga 1 pensil = 2.500 rupiah dan 1 buku = 5.000 rupiah
9x + 4y = RP.42500 | x2 | 18x + 8y= Rp. 85000
____________________________________________-
-6x = Rp.15000
X = 15000:6
X = RP.2500
12x +8y = RP.70000
12.2500 + 8y = RP.70000
30000 +8y = RP.70000
8y = 70000 - 30000
8y = 40000
Y = 40000:8
Y = RP.5000
x + y
2500 + 5000
RP. 7500