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5x+4y=20
Para
X=0
Y=0
5x+4(0)=20 5(0)+4y=20
x=20/5 4y=20
x=4 Respuesta y=20/4
y=5 Respuesta
5x+4y=0+20
5x+4(.0)=20
5x=20
X=20/5=4
X=4
5(0)+4y=20
4Y=20
Y=20/4
Y=5