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Patas de pollos = 2x
Patas de cerdo = 4y
Total de patas= 210
A)x+y=75.
B)2x+4y=210
(-4). X+y =75 ------->. -2x-2y= -150. 2x+4y=210
2x+4y= 210. 2x+4(30)=210
========= 2x+120=210
2y = 60. 2x=210-120
Y=30. 2x= 90
X=45
Hay 45 pollos y 30 cerdos