Question

срочно ♡ пожалуйста ​

Answer 1

Ответ:

1) (-5;-10)

2) (-3;-7/2)

$2)9x - 4y = - 13 \\ 9x - 2y = - 20 \\ \\ 9x - 4y - 9x + 2y = - 13 + 20 \\ - 2y = 7 \\ y = - \frac{7}{2} \\ \\ 9x - 2 \times ( - \frac{7}{2}) = - 20 \\ 9x + 7 = - 20 \\ 9x = - 27 \\ x = - 3$

Объяснение:

$1)3x + 2y = 5 \\ - 5x + 2y = 45 \\ \\ 3x + 5x + 2y - 2y = 5 - 45 \\ 8x = - 40 \\ x = - 5 \\ \\ 3 \times ( - 5) + 2y = 5 \\ - 15 + 2y = 5 \\ 2y = - 20 \\ y = - 10$