Question

x + 4y = 7 -X+2y=8
Por el método de igualacion
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Answer 1

Explicación paso a paso:

$x + 4y = 7 \\ - x + 2y = 8 \\ . \\ x + 4y = 7 \\ x - 2y = - 8 \\ . \\ x =7 - 4y \\ x = 2y - 8 \\. \\ 7 - 4y = 2y - 8 \\ 7 + 8 = 2y + 4y \\ 15 = 6y \\ \frac{16}{5} = y \\ . \\ x + 4( \frac{16}{5} ) = 7 \\ x + \frac{64}{5} = 7 \\ x = 7 - \frac{64}{5} \\ x = \frac{7(5) - 64}{5} \\ x = \frac{35 - 64}{5} \\ x = \frac{ - 29}{5}$