Explicación paso a paso:
[tex]x + y = - 3 \\ - 2x + y = 9 \\ x + y = - 3 \: ( - 1) \\ - 2x + y = 9 \\ - x - y = 3 \\ - 2x + y = 9 \\ - 3x = 12 \\ x = \frac{12}{ - 3} = - 4 \\ x + y = - 3 \\ - 4 + y = - 3 \\ y = - 3 + 4 \\ y = 1[/tex]
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Explicación paso a paso:
[tex]x + y = - 3 \\ - 2x + y = 9 \\ x + y = - 3 \: ( - 1) \\ - 2x + y = 9 \\ - x - y = 3 \\ - 2x + y = 9 \\ - 3x = 12 \\ x = \frac{12}{ - 3} = - 4 \\ x + y = - 3 \\ - 4 + y = - 3 \\ y = - 3 + 4 \\ y = 1[/tex]