Math

Why does the inequality sign change when both sides are multiplied or divided by a negative number?

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  1. suppose we start with an example

    10 > 4 .....true
    multiply by 2
    20 > 8 ... still true

    multiply by -2

    -20 > - 8 .... false
    how do we make it true???
    -20 < -8 ... now true!

    Conclusion???

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    posted by Reiny
  2. Multiply by -1 on both sides?

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    posted by Jessica

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