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    yaya12's Avatar
    yaya12 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 9, 2009, 05:30 PM
    How to do inequality problems
    -8|9+9m| < 72
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    Dec 9, 2009, 08:34 PM

    is the "|" an absolute value sign? I'm not sure whether to interpret that as what I've written below, or not.



    In any inequality, you plot or calculate the curve corresponding to the "=" case. Then, pick a point above or below the curve and determine if it meets the inequality (< in this case). If it doesn't, try the other side (one side has to work). Then, you include all the area.

    If the inequality is < or >, the inequality doesn't include the curve.
    mathwiz3502's Avatar
    mathwiz3502 Posts: 121, Reputation: 1
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    #3

    Dec 10, 2009, 04:15 PM
    First divide by -8 on both sides
    Now take away the abs. value symbol but have the opposite side be negative and positive, two equations may help.
    Now solve.
    InfoJunkie4Life's Avatar
    InfoJunkie4Life Posts: 1,409, Reputation: 81
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    #4

    Dec 13, 2009, 01:14 PM

    Isn't there some rule, if you multiply by a negative, you have to switch the orientation of the inequality?
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