Cerdos + Gallinas = 34 patas Cerdos + Gallinas = 10 cabezas
X + Y = 10
Gallinas = 2Y X = 10 - Y
Cerdos = 4X
4X + 2Y = 34
4(10 - Y) + 2Y = 34
40 - 4Y + 2Y = 34
40 - 2Y = 34
40 - 34 = 2Y
6 = 2Y
6/2 = Y
3 = Y Y = Gallinas = 3 gallinas
X + Y = 10
X + 3 = 10
X = 10 - 3
X = 7 X = Cerdos = 7 cerdos