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harg buku = x
harga pensil = y
maka :
12x + 8y = 88.000
x = 3y
subtitusi nilai x :
12x + 8y = 88.000
12(3y) + 8y = 88.000
36y + 8y = 88.000
44 y = 88.000
y = 88.000 / 44
y = 2.000
jadi :
harga pensil = 2.000
harga buku = 3 (2.000) = 6.000
6 buku + 5 pensil = 6 (6.000) + 5 (2.000)
= 36.000 + 10.000
= Rp 46.000
pensil = y
12x + 8y = 88.000
x = 3y --> x - 3y = 0
12x + 8y = 88.000 | x3 36x +24y = 264
x - 3y = 0 | x8 8x - 24y = 0 +
44x = 264
x = 6
y = 2
6x + 5y = (6x6) + (5x2) = 36 + 10 = 46
Rp 46.000,00