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2).x+y = 4
Despejar (x) en 1
2x+2y=8
x = 8-2y /2
Reemplazar valor de ( x) en ( 2 )
x+y=4
8-2y/2 + y=4
8-2y=2(4-y)
8-2y=8-2y
2y-2y=8-8
0=0
Y=0
Reemplazar y=0 en (1)o(2)
2x+2y=8
2x+2(0)=8
2x+0=8
x=8/2
x=4
¬¬
x=4;y=0