You can
put this solution on YOUR website!1. Substitute the value into the inequality. If the result is a true statement, then the value is a solution. Otherwise not.
2. No difference. Use the same procedure and criteria.
3. A value can be a solution to both an equation and the inequality created if the equals sign in that equation is replaced by an inequality sign if and only if the inequality sign includes 'or equals' as in ≤ or ≥.
4. You can make up your own inequality.