Resposta :
Resolução!
X = Patos
Y = Cachorro
x + y = 23 >>>>>>>>>> x = 23 - y
2x + 4y = 62
2 ( 23 - y ) + 4y = 62
46 - 2y + 4y = 62
2y = 62 - 46
2y = 16
Y = 16/2
Y = 8
X = 23 - y
X = 23 - 8
X = Patos
Y = Cachorro
x + y = 23 >>>>>>>>>> x = 23 - y
2x + 4y = 62
2 ( 23 - y ) + 4y = 62
46 - 2y + 4y = 62
2y = 62 - 46
2y = 16
Y = 16/2
X = 23 - y
X = 23 - 8