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Gallinas = t
s + t = 80
4s + 2t = 220
Despejo s en ecuación 1
s + t = 80
s = 80 - t
Sustituyo el despeje de s en ecuación 2
4s + 2t = 220
4 (80 - t) + 2t = 220
320 - 4t + 2t = 220
- 4t + 2t = 220 - 320
- 2t = - 100
t = - 100/-2
t = 50
El valor de t lo sustituyo en el despeje de s
s = 80 - t
s = 80 - 50
s = 30
Hay 30 vacas y 50 gallinas