Facing a problem in solving for $x$ from $-2x-1>49$











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Solve for $x$, $$-2x-1>49tag1$$



$$-2x>49+1tag2$$
$$x>50div (-2)tag3$$



$$x>-25tag4$$



But my teacher says it is wrong!!



How? I have followed all the steps in my calculation!!






algebra-precalculus inequality







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    up vote
    0
    down vote

    favorite












    Solve for $x$, $$-2x-1>49tag1$$



    $$-2x>49+1tag2$$
    $$x>50div (-2)tag3$$



    $$x>-25tag4$$



    But my teacher says it is wrong!!



    How? I have followed all the steps in my calculation!!






    algebra-precalculus inequality







    share|cite|improve this question









    New contributor




    Bonjour is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      Solve for $x$, $$-2x-1>49tag1$$



      $$-2x>49+1tag2$$
      $$x>50div (-2)tag3$$



      $$x>-25tag4$$



      But my teacher says it is wrong!!



      How? I have followed all the steps in my calculation!!






      algebra-precalculus inequality







      share|cite|improve this question









      New contributor




      Bonjour is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      Solve for $x$, $$-2x-1>49tag1$$



      $$-2x>49+1tag2$$
      $$x>50div (-2)tag3$$



      $$x>-25tag4$$



      But my teacher says it is wrong!!



      How? I have followed all the steps in my calculation!!






      algebra-precalculus inequality




      algebra-precalculus inequality






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      edited 10 mins ago









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      asked 4 hours ago









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          It is wrong because when you divided by $-2$ you should have reversed the inequality ($-2<0$).






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            It is wrong because when you divided by $-2$ you should have reversed the inequality ($-2<0$).






            share|cite|improve this answer

























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              It is wrong because when you divided by $-2$ you should have reversed the inequality ($-2<0$).






              share|cite|improve this answer























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                up vote
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                It is wrong because when you divided by $-2$ you should have reversed the inequality ($-2<0$).






                share|cite|improve this answer












                It is wrong because when you divided by $-2$ you should have reversed the inequality ($-2<0$).







                share|cite|improve this answer












                share|cite|improve this answer



                share|cite|improve this answer










                answered 4 hours ago









                José Carlos Santos

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                137k17109199






















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