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Sepatu = x
Sendal = y
Maka modelnya :
x = 2y
x + y = 82.500
Metode Subtitusi :
x + y = 82.500
(2y) + y = 82.500
3y = 82.500
y = 82.500/3
y = 27.500
Masukkan y :
x = 2y
x = 2(27.500)
x = 55.000
Jadi, harga sepasang sepatu = Rp 55.000 dan sendal = Rp 27.500