anonymous
  • anonymous
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
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
\[-3s \ge 18\] 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.
anonymous
  • anonymous
s has to be smaller than -6. like -7 is smaller than -6. Rest is correct.
anonymous
  • anonymous
ok. Thanks

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anonymous
  • anonymous
@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.
anonymous
  • anonymous
great example.....thanks

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