Explicación paso a paso:
[tex] - 3x - y = 0 \\ x + y = 3 \\ - 3x - y = 0 \\ x + y = 3(3) \\ - 3x - y = 0 \\ 3x + 3y = 9 \\ 2y = 9 \\ y = \frac{9}{2} \\ x + y = 3 \\ x + \frac{9}{2} = 3 \\ x = 3 - \frac{9}{2} \\ x = \frac{6 - 9}{2} = \frac{ - 3}{2} [/tex]
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Explicación paso a paso:
[tex] - 3x - y = 0 \\ x + y = 3 \\ - 3x - y = 0 \\ x + y = 3(3) \\ - 3x - y = 0 \\ 3x + 3y = 9 \\ 2y = 9 \\ y = \frac{9}{2} \\ x + y = 3 \\ x + \frac{9}{2} = 3 \\ x = 3 - \frac{9}{2} \\ x = \frac{6 - 9}{2} = \frac{ - 3}{2} [/tex]