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Buku Gambar = y
Yulis, 4x + 2 y = Rp. 8000,-
Rani, 3x + y = Rp. 5000,-
3x + y = Rp. 5000,- -------> (x2) 6x + 2y = Rp. 10.000,-
4x + 2y + Rp. 8000,- --------> 4x + 2y = Rp. 8.000,-
------------------------------------ (-)
2x = Rp. 2000,-
x = Rp. 1000,- (Harga 1 Buku Tulis)
Buku Tulis = X
Buku Gambar = Y
Gunakan metode eliminasi
(Yulis) 4X + 2Y = Rp8.000 × 1
(Rani) 3X + 1Y = Rp5.000 × 2
(Yulis) 4X + 2Y = Rp8.000
(Rani) 6X + 2Y = Rp10.000 (Dikurangi)
(Hasil) -2X + 0 = Rp-2.000
-2X = Rp-2.000
X = Rp-2.000/-2
X = Rp1.000
Jawabannya: A. Rp1.000,00