The sign is "greater than or equal to" or ≥
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When you divide both sides of an inequality by a negative number, the inequality sign flips.
With the equal sign (=).
When solving an inequality, you must revers the inequality sign when you multiply (or divide) both sides by a negative number.
No, you only flip the inequality sign if you are dividing by a negative number on both sides of the inequality
Basically. If the inequality's sign is < or ≤, then you shade the part under the line. If the inequality's sign is > or ≥, then you shade the part over the line.