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-2x+y=4
hacemos reduccion
multiplicamos la segunda ecuacion por -1 asi eliminamos "y"
3x+y= -6.......................3x+y= -6
-1(-2x+y=4)....................2x-y= -4
5x= -10.............x= -10/5........x= -2
si x= -2
3x+y= -6
3(-2)+y= -6
-6+y= -6
y= -6+6
y=0
solucion:
x= -2 y=0