Question

Помогите пожалуйста решить задания

Answer 1

Объяснение:

$x + 3y = 4 \\ 2x - y = 1$

$x = 4 - 3y \\ 2x - y = 1$

$2(4 - 3y) - y = 1$

$y = 1$

$x = 4 - 3 \times 1$

$x = 1$

$y = 1$

$x - 3y = 4 \\ 2x + y = 15$

$x = 4 + 3y \\ 2x + y = 15$

$2(4 + 3y) + y = 15$

$y = 1$

$x = 4 + 3 \times 1$

$x = 7$

$y = 1$

$0.2x + 0.3y = 1.2 \\ 0.5x - 0.6y = 0.3$

$x = 6 - 1.5y \\ 0.5x - 0.6y = 0.3$

$0.5(6 - 1.5y) - 0.6y = 0.3$

$y = 2$

$x = 6 - 1.5 \times 2$

$x = 3$

$y = 2$

Надеюсь помогла