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y= borregos
x+y=60
x= 60-y ---( 1 )
gallinas= 2 patas
borregos = 4 patas
total= 150 patas
2x+ 4y= 150 ---(2)
Sustituyendo 1 en 2
2(60-y)+4y= 150
120-2y+4y= 150
2y= 150-120
2y= 30
y= 30/2
y= 15 Borregos
x=60-y
x= 69-15
x= 45 gallinas
Comprobación
x+y=60
45+15= 60
60=60