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5m + 4c = 160
Al multiplicar por -1.25 a la segunda expresión y sumarla a ala primera queda así:
3m + 5c = 135
-6.25m - 5c = -200
-3.25 m = -65
m = -65/-3.25
m = 20
3m + 5c = 135
(3*20) + 5c = 135
5c = 135-60
5c = 75
c = 75/5
c = 15
Comprobación:
5m + 4c = 160
(5*20) + (4*15) = 160
100 + 60 = 160
Respuesta:
Barra de mantequilla: $20
Litro de leche: $15