Question

How do you solve and graph the compound inequality `-9 < -2s - 1<=-7` ?

Answer 1

Solve: `-9 < -2s - 1 <= - 7`

Explanation:

`- 9 + 1 < -2s <+ -7 + 1 --> - 8 < -2s <= - 6`

`2s < 8 -> s < 4`

`2s >= 6 -> s >= 3`

-------------------|0 --------------|3=====|4-------------

Note. The end (critical) point (3) is included in the solution set.
Answer: half closed interval [3, 4)