Question

алгебра 7 клас допоможіть

Answer 1

Ответ:

1)(0,25;-0,5) 2)(3;-2)

Объяснение:

$2x - 3y = - 10 \\ 6x - y = 2 \\ y = 2 + 6x \\ 2x - 3(2 + 6x) = - 10 \\ 2x - 6 - 18x = - 10 \\ - 16x = - 4 \\ x = 0.25 \\ (6 \times 0.25) - y = 2 \\ 1.5 - y = 2 \\ y = - 0.5$

2)

$2x + 5y = - 4 \\ 7x - 2y = 25 \\ 4x + 10y = - 8 \\ 35x - 10y = 125 \\ 39x = 117 \\ x = 3 \\ 6 + 5y = - 4 \\ 5y = - 10 \\ y = - 2 \\ (3 \: \: - 2)$