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Math Help - Some simple absolute value equations

  1. #1
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    Some simple absolute value equations

    Dear forum members,

    I have two equations to solve




    b) (x-11)=16

    c) (x+1)=6


    NOTE! PLEASE PRETEND THE PARENTHESES ARE ABSOLUTE VALUE BARS.



    I know how to solve them, but there is something in my teacher's answers which baffles me.

    for b) she wrote x=-5 or X=-7 and for c) =-7 and x=5


    Why use or in b and then and in c?





    Could someone please explain?




    Thank you in advance!
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  2. #2
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    Quote Originally Posted by Coach View Post
    I have two equations to solve

    b) (x-11)=16

    c) (x+1)=6

    I know how to solve them, but there is something in my teacher's answers which baffles me.

    for b) she wrote x=-5 or X=-7 ... Wrong. x=-5~\vee~ x=27

    and for c) =-7 and x=5 ... Wrong. x=-7~\vee~ x=5

    ...
    Definately the "and" is wrong.

    I've attached a drawing which gives the solutions of the equations graphically.

    The first equation is drawn in black, the second one in red.
    Attached Thumbnails Attached Thumbnails Some simple absolute value equations-zweibetrag_coach.jpg  
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