Section 4-2
Compound Inequalities
A compound inequality is two or more inequalities joined together with or or and. For example:
x < –3 or x
2

When two inequalities are joined with and, they are often written simply as a double inequality, like:
–1
x < 2
(In other words, x
–1 and x < 2.)

To solve an or-type compound inequality, just solve the two sentences seperately. To solve an and-type compound inequality, just make sure that if you add a number or multiply by a number, you do it to all three parts of the inequality.