Question

Помогите решить 2x+y=3
3x+4y=-10

Answer 1

Ответ:

$x = 4.4 \\ y = - 5 .8$

$2x + y = 3 \\ 3x + 4y = - 10 \\ y = 3 - 2x$

Подставляем

$3x + 4(3 - 2x) = - 10 \\ 3x + 12 - 8x = - 10 \\ - 5x = - 22 \\ 5x = 22 \\ x = 22 \div 5 \\ x = 4.4$

$y = 3 - (2 \times 4.4) \\ y = - 5.8$