Question

Resolver:
. x - 2y = 8 (1)
. 5x + 6y = 4 (2)

Answer 1

Respuesta:

$x - 2y = 8 \: \: \: ( \times - 5) \\ - 5x + 10y = - 40 \\ 5x + 6y = 4 \\ 16y = - 36 \\ y = \frac{ - 36}{16} = \frac{ - 18}{8} = \frac{ - 9}{4}$

$x - 2y = 8 \\ x = 8 + 2y \\ x = 8 + 2 \frac{ - 9}{4} \\ = 8 + \frac{ - 18}{4 } = \\ \frac{32}{4} + \frac{ - 18}{4} = \frac{14}{4}$

$x - 2y = 8 \\ \frac{14}{4} - 2 \frac{ - 9}{4} = \frac{14}{4} - \frac{ - 18}{4} = \\ = \frac{32}{4} = 8$

$5x + 6y = 4 \\ 5 \frac{14}{4} + 6 \frac{ - 9}{4} = \frac{70}{4} + \frac{ - 54}{4} = \frac{16}{4} = 4$

Explicación paso a paso:

espero te sirva