Why do we have to flip the sign when we divide or multiply by negative one - Cool Math

The video tutorial explains how to solve inequalities, emphasizing the importance of solving for positive variables. It highlights the rule of flipping the inequality sign when multiplying or dividing by a negative number. The tutorial reviews the addition property of equality and provides examples to illustrate these concepts. The key takeaway is to always flip the sign when dealing with negative numbers to maintain the truth of the inequality.

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