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Math Help - values of x below the x axis

  1. #1
    rcs
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    values of x below the x axis

    May i know what this problem all about... i just can imagine how it looks like but l as the values of x, how it is being done? how to write as set for the values of x? can anybody help?

    For what values of x is the graph of 2x 3y 4 = 0 below the x axis?


    ​thanks a lot
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    Last edited by rcs; December 8th 2012 at 06:41 PM.
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    Re: values of x below the x axis

    For the graph to be below the x-axis you need to havey<0.

    So solve for y to get y=(2x-4)/3 and proceed to find the values of x for which the equation yields values less than 0.

    As an example of how to express a set of (real) values, if you find that b<x<a [a,b are arbitrary constants] then the set of values x must belong to is (b,a).
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  3. #3
    rcs
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    Re: values of x below the x axis

    will i think it should be done this way

    x = (- infinity , 2)

    can anybody correct my work if it's not right.

    thanks
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    Re: values of x below the x axis

    you are correct
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