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-4x-10y=36 2 por eliminación queda
-5y = 20
y = 20/-5
y= -4 reemplazo el valor de y en 1
4x+5y=-16
4x+5(-4)=-16
4x -20=-16
4x = -16 +20
4x = 4
x=4/4
x= 1