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Metodo de sustitucion:
-x - 2y = 4
3x + y = 6
Despejamos x en la ecuacion 1, y la sustituimos el valor en la ecuacion dos:
x = 4 + 2y/-1
3x + y = 6
3(4 + 2y/-1) + y = 6
12 + 6y/-1 + y = 6
-12 - 6y + y = 6
-5y = 6 + 12
y = 18/-5
y = - 18/5
Ahora:
3x + y = 6
3x - 18/5 = 6
3x = 6 + 18/5
3x = 48/5
x = 16/5
Respuesta:
x = 16/5
y = - 18/5