Question

РИЩИТЕ СИСТЕМУ УРАВНЕНИЙ
Х-2У=5
3Х+8У=1

Answer 1

Решение и ответ - на фотографии

Answer 2

$\left \{ {{x - 2 = 5} \atop {3x + 8y = 1}} \right. \\ x = 5 + 2y \\ 3(5 + 2y) + 8y = 1\\ 15 + 6y + 8y = 1 \\ 15 + 14y = 1 \\ 14y = 1 - 15 \\14y = - 14 \\ y = \frac{ - 14}{14} \\ y = - 1$

$3x + 8 \times ( - 1) = 1 \\ 3x - 8 = 1 \\ 3x = 1 + 8 \\ 3x = 9 \\ x = \frac{9}{3} \\ x = 3$

Ответ: $x = 3; \: \: y = -1.$