Example 3

The shaded half plane in the graph shown represents the solution set for the inequality . Use both substitution and the graph of the inequality to determine which values from the set make the inequality true.
  1. Use substitution to determine if makes the inequality true.
  2. Use the graph of the inequality to determine if makes the inequality true.
  3. Use substitution to determine if makes the inequality true.
  4. Use the graph of the inequality to determine if makes the inequality true.
  5. Use substitution to determine if makes the inequality true.
  6. Use the graph of the inequality to determine if makes the inequality true.
  7. Use substitution to determine if makes the inequality true.
  8. Use the graph of the inequality to determine if makes the inequality true.
  9. Summarize your results.
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