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Math Help - I have a question that I don't know how to do.

  1. #1
    Newbie
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    Jul 2009
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    I have a question that I don't know how to do.

    Calculate the area bounded by the equations: y= 15 - 3x and y/3 +4 = 2x and the x-axis.

    Could you do it step by step and show your working for me?

    The answer is 9.
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  2. #2
    MHF Contributor

    Joined
    Apr 2005
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    Have you tried to do anything at all for yourself? Have you graphed the lines? If so, then you know that you are asked for the area of a triangle.

    The formula for area of a triangle is (1/2)bh where b is the length of the base and h is the height. Here, b is equal to the difference of x values where the two line cross the x-axis. h is the y value where the two lines cross.
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