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1/3 lusin = 1/3 x 12 = 4 buah
sendok = x
garpu = y
12x + 4y = 1.160
x = 75
maka y = ?
Jawab :
subitusi x ke dlm persamaan
12x + 4y = 1.160
12(75) + 4y = 1.160
4y = 1.160 - 900
4y = 260
y = 65
jadi satu biji sendok seharga 65 rupiah
Garpu = 4 (y)
12x + 4y = 1160
X = 75
12(75) + 4y = 1160
900 + 4y = 1160
4y = 1160 - 900
4y = 260
y = 260/4
y = 65
Jadi harga 1 biji garpu adalah Rp.65,-