Question

3х+4y=0
2x-7y=29. решите​

Answer 1

Ответ:

(4;-3)

Пошаговое объяснение:

$3x + 4y = 0( \times - 2) \\ 2x - 7y = 29( \times 3) \\ \\ - 6x - 8y = 0 \\ 6x - 21y = 29 \times 3 \\ \\ - 6x + 6x - 8y - 21y = 29 \times 3 \\ - 29y = 29 \times 3 \\ - y = 3 \\ y = - 3 \\ \\ 3x + 4 \times ( - 3) = 0 \\ 3x - 12 = 0 \\ 3x = 12 \\ x = 4$