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Susu = S
Donat = D
Didapat persamaan
2s + 2d= 66.000
4s+ 3 d = 117.000
6s + 6 d = 198.000 [x3]
8s + 6 d = 234.000 [x2]
--------------------------------
-2s = -36.000
segelas susu = 18.000
x= susu
y= donat
2x + 2y= 66.000 |×3|
4x + 3y= 117.000 |×2|
6x + 6y= 198.000
8x + 6y= 234.000 _
-2x= -36.000
x= -36.000/-2
x= 18.000
2x + 2y= 66.000
2(18.000) + 2y= 66.000
36.000 + 2y= 66.000
2y= 66.000 - 36.000
2y= 30.000
y= 30.000/2
y= 15.000
Jadi, harga segelas susu (x) adalah Rp 18.000,00