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Coolmath Algebra
Solving Inequalities Lesson 5 - The Freaky Thing (page 2 of 4)
---- This algebra lesson explains the freaky thing that can happen when you are solving inequalities

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But, it's easy to fix!

When you multiply or divide an inequality by a negative number, FLIP THE SIGN!

Let's try it:

-3x is less than or equal to 6, divide by -3 and flip the sign which gives x is greater than or equal to -2

Check it:

        when x = -2 we already know this works because of the equals ( = ) part

when x = 0, -3 ( 0 ) is less than or equal to 6 which gives 0 is less than or equal to 6. Yep!

     when x = -10, -3 ( -10 ) is less than or equal to 6 which gives 30 is less than or equal to 6. Nope!

OK, we have it now!

[ -2 , infinity )

Continued on the next page

 The printing and distribution and/or downloading of these lessons is strictly prohibited.
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