Jawaban:
buku = x
pulpen = y
2x + y = 9000 (×2)
3x + 2y = 14500 (×1) _
4x + 2y = 18000
3x + 2y = 14500
x = 3500 (Harga buku)
2x + y = 9000
2(3500) + y = 9000
7000 + y = 9000
y = 9000 - 7000 = 2000 (Harga pulpen)
JADI
4x + 5y = 4(3500) + 5(2000) = 14000 + 10000 = 24000
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Jawaban:
buku = x
pulpen = y
2x + y = 9000 (×2)
3x + 2y = 14500 (×1) _
4x + 2y = 18000
3x + 2y = 14500
x = 3500 (Harga buku)
2x + y = 9000
2(3500) + y = 9000
7000 + y = 9000
y = 9000 - 7000 = 2000 (Harga pulpen)
JADI
4x + 5y = 4(3500) + 5(2000) = 14000 + 10000 = 24000