Algebra I Recipe: Solving Absolute Value Inequalities
By G Redden
- Isolate the absolute value using inverse operations.
- Write a compound sentence.
- With “AND” if you have < or ≤ after isolating.
- With “OR” if you have > or ≥ after isolating
- Sentence 1 – is the isolated inequality without the absolute value bars
- Sentence 2 – looks like sentence 1 except change the inequality symbol and change the number on the right to it’s opposite.
- Solve each sentence (inequality) for the variable.
- Graph the solution.
1.
| 3x - 15| < 12
2.
| 4 - x | ≥ 2
3.
| 5x + 1 | - 8 ≤ 16
4.
| 2x + 5 | - 1 < 6
5.
| 3x + 2 | - 1 ≥ 10