Explicación paso a paso:
[tex]x - 2y = 5 \\ x = 5 + 2y \\ \\ x + 3y = 20 \\ x = 20 - 3y \\ \\ 5 + 2y = 20 - 3y \\ - 20 + 5 = - 3y - 2y \\ - 15 = - 5y \\ 5y = 15 \\ y = \frac{15}{5} = 3[/tex]
[tex]x = 5 + 2y = 5 + 2 \times 3 = 5 + 6 = 11 \\ [/tex]
[tex]11 - 2 \times 3 = 11 - 6 = 5 \\ 11 + 3 \times 3 = 11 + 9 = 20[/tex]
espero te sirva
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Explicación paso a paso:
[tex]x - 2y = 5 \\ x = 5 + 2y \\ \\ x + 3y = 20 \\ x = 20 - 3y \\ \\ 5 + 2y = 20 - 3y \\ - 20 + 5 = - 3y - 2y \\ - 15 = - 5y \\ 5y = 15 \\ y = \frac{15}{5} = 3[/tex]
[tex]x = 5 + 2y = 5 + 2 \times 3 = 5 + 6 = 11 \\ [/tex]
[tex]11 - 2 \times 3 = 11 - 6 = 5 \\ 11 + 3 \times 3 = 11 + 9 = 20[/tex]
espero te sirva