Description: Our discussion of linear inequalities begins with multiplying and dividing by negative numbers. Listen closely for the word "swap." Super important! Created by Sal Khan and CK-12 Foundation. In this video, I want to tackle some inequalities that involve multiplying and dividing by positive and negative numbers, and you'll see that it's a little bit more tricky than just the adding and subtracting numbers that we saw in the last video. I also want to introduce you to some other types of notations for describing the solution set of an inequality. So let's say I had negative 0.5x is less than or equal to 7.5.*Teacher Advisor is 100% free.