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cgliss

  • 3 years ago

Morning. I'm needing to check some of my son's test answers. Solve for s. show all steps. -3s is greater than or equal to 18.....he put -3(-6) is greater than or equal to 18...so s is greater than or equal to -6

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  1. Traxter
    • 3 years ago
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    \[-3s \ge 18\] Divide both sides by -3 (so flip inequality): \[s\le -6\] He needs to remember to flip the inequality sign whenever he multiplies/divides by a negative number.

  2. pitankar
    • 3 years ago
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    s has to be smaller than -6. like -7 is smaller than -6. Rest is correct.

  3. cgliss
    • 3 years ago
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    ok. Thanks

  4. Traxter
    • 3 years ago
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    @cgliss if you want to explain to him why this happens, give him the example of -1<5. If you multiply both sides by -1 without swapping the inequality sign around, you get 1<-5. This doesn't make sense, so you have to flip it to 1>-5.

  5. cgliss
    • 3 years ago
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    great example.....thanks

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