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2x + y = -400.......... (2)
x + 2y = 150............. (3)
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x - y = - 550........... (4)
Luego sumamos (4) y (1):
x + y = 170....... (1)
Entonces en (4) y (1)
x - y = -550............ (4)
x + y = 170.............. (1)
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2x = 720
x = 360
Reemplazamos el valor de x en la ecuación (1):
x + y = 170......... (1)
360 + y = 170
y = 170 - 360
y = -190