Respuesta:
Vacas = x
Gallinas = y
x + y = 20 (cabezas)
4x + 2y = 64 (patas)
Paso 1:
x + y = 20
y = 20 - x
Paso 2:
4x + 2(20 - x) = 64
4x + 40 - 2x = 64
2x + 40 = 64
2x = 64 - 40
2x = 24
x = 24/2
x = 12
12 + y = 20
y = 20 - 12
y = 8
Paso 3:
Reemplazamos
12 + 8 = 20
Rpta: Hay 12 vacas y 8 gallinas
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Respuesta:
Vacas = x
Gallinas = y
x + y = 20 (cabezas)
4x + 2y = 64 (patas)
Paso 1:
x + y = 20
y = 20 - x
Paso 2:
4x + 2(20 - x) = 64
4x + 40 - 2x = 64
2x + 40 = 64
2x = 64 - 40
2x = 24
x = 24/2
x = 12
12 + y = 20
y = 20 - 12
y = 8
Paso 3:
Reemplazamos
12 + 8 = 20
Rpta: Hay 12 vacas y 8 gallinas