Question

Решите двойное неравенство -30 ≤ 3-11y ≤ -8 .

Answer 1

$-30 \leq 3-11y \leq -8 \\ -33 \leq -11y \leq -11 \\ 3 \geq y \geq 1$

Ответ: y∈[1;3]