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x - 5y = -8
x= -8+5y
-2(-8+5y)+2y=0
16-10y+2y=0
16-8y=0
-8y=0-16
-8y=-16
y=-16/-8
y=2
-2x+2y=0
-2x+2(2)=0
-2x+4=0
-2x=0-4
x=-4/-2
x=2
comprobamos
-2x+2y=0
-2(2)+2(2)=0
-4+4=0
0=0
x - 5y = -8
2 - 5(2) = -8
2 - 10 = -8
-8 = -8
saludos