Question

ПОМОГИТЕ ПОЖАЛУЙСТА!!​

Answer 1

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

$x = - 15 \\ y = - 4$

$- ( - 15) - ( - 4) - 4 \\ 15 + 4 - 4 \\ 15 + 0 = 15$

2.

$3 \times 1 \times ( - 1) {}^{3} + 1 {}^{2} \times ( - 1) {}^{2} - 2 \times 1 \times ( - 1) {}^{3} + 1 {}^{3} \times ( - 1) - 1 {}^{4}$

$3 \times 1 \times ( - 1) + 1 \times 1 - 2 \times 1 \times ( - 1) + 1 \times ( - 1) - 1$

$- 3 + 1 \times 1 + 2 - 1 \times 1 - 1 \\ - 3 + 2 - 1 \\ - 2$