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Because when you fit in the variables, it wouldn't be true. therefore, you have to flip the inequality sign

For example,

3 > 2 True

3(-2) > 2(-2)

-6 > -4 False

If you change the direction of the inequality symbol, in the same time that you multiply by a negative number, then you find a true statement.

3 > 2 True

3(-2) < 2(-2)

-6 < -4 True

This is because the greater the absolute value of a negative number, the lesser it is, while the opposite is true for a positive number. When you multiply by a negative, a very large number becomes very small, or the opposite.

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Q: Why do you flip the inequality sign when multiplying by a negative number?
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