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2)4x+y=15 *(-2)--->-8x-2y=-30 aqui se simplifica el 2y
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-5x=-20 dividido para (-5)
x=4
reemplazamos en cualquier ecuacion inicial
reemplazo
2)4x+y=15 solucion COMPROBACION
4(4)+y=15 X=4 4x+y=15
16+y=15 y=-1 4(4)+(-1)=15
y=15-16 16-1=15
y=-1 15=15