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2)2x - 3y = -8
despejamos en uno
3x=1-2y
x=(1-2y)/3
remplazamos en dos
2x - 3y = -8
2(1-2y/3)=-8
1-2y/3=-8/2
1-2y=-4(3)
-2y=-12-1
-y=-13/2
y=13/2
remplazamos en 1
3x + 2y = 1
3x+2(13/2)=1
3x+26/2=1
3x=1-13
3x=-12
x=-12/2
x=-6