3. Solving Inequalities Using Multiplication or Division
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When the inequality symbol needs to be reversed?
Example Solution: - 2x < 10
We want to write an inequality that is solved using the Division Property of Inequality and where the inequality symbol needs to be reversed. Let's recall the Division Property of Inequality for negative divisors.
Division Property of Inequality |
When dividing each side of an inequality by the same negative number, the direction of the inequality symbol must be reversed to produce an equivalent inequality. |
Divide by - 2 and flip inequality sign
Put minus sign in front of fraction
Calculate quotient
Inequality | Divide | Simplify |
---|---|---|
- 3m ≥ 15 | m ≤ 15/- 3 | m ≤ - 5 |
14 < - 7a | 14/- 7 > a | - 2 > a |
36 ≤ - 6y | 36/- 6 ≥ y | - 6 ≥ y |