Question

Which value is part of the solution set of the inequality 5x - 1 = < 4

Answer 1

I think you mean 5x − 1 ≤ 4 (or possibly 5x − 1 < 4). Solve:

5x − 1 ≤ 4 → 5x ≤ 5 → x ≤ 1.
(If it were < you get x < 1.)

So any number ≤ 1 is in the solution set. Examples: 1, 0, −2. If the inequality was strict (<), then 0 (but not 1) is in the solution set.