Explicación paso a paso:
[tex]x - y = 5 \\ 2x + 3y = 20 \\ x - y = 5( - 2) \\ 2x + 3y = 20 \\ - 2x + 2y = - 10 \\ 2x + 3y = 20 \\ 5y = 10 \\ y = \frac{10}{5} = 2 \\ x - y = 5 \\ x - 2 = 5 \\ x = 5 + 2 = 7[/tex]
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Explicación paso a paso:
[tex]x - y = 5 \\ 2x + 3y = 20 \\ x - y = 5( - 2) \\ 2x + 3y = 20 \\ - 2x + 2y = - 10 \\ 2x + 3y = 20 \\ 5y = 10 \\ y = \frac{10}{5} = 2 \\ x - y = 5 \\ x - 2 = 5 \\ x = 5 + 2 = 7[/tex]