Question

x + 4y = 1
2x + y = -5​

Answer 1

Respuesta:

$x + 4y = 1 \\ x = 1 - 4y \\ 2x + y - 5 \\ 2 \times (1 - 4y) + y = - 5 \\ 2 - 8y + y = - 5 \\ 2 - 7y = - 5 \\ - 7y = - 5 - 2 \\ - 7y = - 7 \\ 7y = 7 \\ y = \frac{7}{7} = 1$

$x + 4y = 1 \\ x = 1 - 4y \\ x = 1 - 4(1) \\ x = 1 - 4 \\ x = - 3$

Explicación paso a paso:

$- 3 + 4 \times (1) = 1$

$2x + y = - 5 \\ 2 \times ( - 3) + 1 = - 6 + 1 = - 5$