Respuestas

  • Usuario de Brainly
2014-01-14T13:48:47+01:00
X=conejos--8
y=gallinas--5
x +y =13--total de animales
4x+2y=42---total de patas


x+y=13
x=13-y
reeplazo
4x+2y=42
4(13-y)+2y=42
52-4y+2y=42
10=2y
10/2=y
5=y

x+y=13
x+5=13
x=8
  • Usuario de Brainly
2014-01-14T13:51:44+01:00
Conejos = x
gallinas =13-x

4x +2(13-x) =42
4x+26-2x =42
2x =42-26
2x =16
x=16/2
x= 8 conejos
gallinas =13-x
gallinas = 13-8 =5
gallinas =5