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Math Help - A problem with sketching lines on the graphic calculator.

  1. #1
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    A problem with sketching lines on the graphic calculator.

    I have just changed courses - from Math 10 to Math 20 - and it's hard to get used to it. The problem is the following.

    The equation C=50w+300 could be used to model the cost of running the business, where w is the number of weeks and C is the cost in dollars.
    The equation M=150w could be used to model the earnings, where w is the number of weeks and M is the money earned in dollars.
    -On the calculator, sketch both lines so that you can clearly see where they intersect. Determine the intersection. Explain what this point means in relation to the business.

    What I did was
    C=M
    50w+300=150w
    w=3 (The intersection. The business starts making a profit after 3 weeks.)
    But how do I sketch the lines?
    Last edited by mr fantastic; February 28th 2011 at 10:56 AM. Reason: Title.
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by Eloise1995 View Post
    I have just changed courses - from Math 10 to Math 20 - and it's hard to get used to it. The problem is the following.

    The equation C=50w+300 could be used to model the cost of running the business, where w is the number of weeks and C is the cost in dollars.
    The equation M=150w could be used to model the earnings, where w is the number of weeks and M is the money earned in dollars.
    -On the calculator, sketch both lines so that you can clearly see where they intersect. Determine the intersection. Explain what this point means in relation to the business.

    What I did was
    C=M
    50w+300=150w
    w=3 (The intersection. The business starts making a profit after 3 weeks.)
    But how do I sketch the lines?
    Hi Eloise1995,


    How about something like this?


    Attached Thumbnails Attached Thumbnails A problem with sketching lines on the graphic calculator.-business.jpg  
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  3. #3
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    graphed on a TI-83+
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  4. #4
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    Thank you so much! It does seem very simple, now.
    But how did determine the values for WINDOW?
    Last edited by Eloise1995; February 28th 2011 at 09:17 AM.
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