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Math Help - graph problem

  1. #1
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    graph problem

    Sorry, new to this kind of thing. Just recieved assignments prior to starting a course and oh my gosh, its like rocket science to me having left school 20 years ago. These questions may seem simple to you, but they are as hard as the job i am currently doing overseas is to me. Please be gentle with me as the precious little brain i have is fragile. So here goes:-

    Q1. Assume that you have plotted the graph of y = x^2 - 5x + 3 choose the option which corresponds to the additional line you would draw on your graph paper in order to solve graphically the equation x^2-5x=4.

    Show all workings.

    Q2. Assume that you have plotted the graph of y = x^2 - 7x + 8 choose the option which corresponds to the additional line you would draw on your graph paper in order to solve graphically the equation x^2 - 3x + 1 = 0.

    Show all workings.

    If anybody can help i would be very greatful.

    curly
    Last edited by mr fantastic; January 21st 2009 at 10:38 PM. Reason: replaced a 'd' with an 'sh' .... Can anyone see where ...?
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  2. #2
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    Quote Originally Posted by curlythornhill View Post
    Sorry, new to this kind of thing. Just recieved assignments prior to starting a course and oh my god, its like rocket science to me having left school 20 years ago. These questions may seem simple to you, but they are as hard as the job i am currently doing overseas is to me. Please be gentle with me as the precious little brain i have is fragile. So here goes:-

    Q1. Assume that you have plotted the graph of y = x^2 - 5x + 3 choose the option which corresponds to the additional line you would draw on your graph paper in order to solve graphically the equation x^2-5x=4.

    Show all workings.

    Q2. Assume that you have plotted the graph of y = x^2 - 7x + 8 choose the option which corresponds to the additional line you would draw on your graph paper in order to solve graphically the equation x^2 - 3x + 1 = 0.

    Show all workings.

    If anybody can help i would be very greatful.

    curly
    For 1. If x^2 - 5x = 4 and y = x^2 -5x + 3 then y = 4 + 3 = 7 (can you see why?)

    So the extra line you will draw is y = 7.


    For 2. If x^2 - 3x + 1 = 0 and y = x^2 - 7x + 8, then

     y = x^2 - 3x + 1 - 4x + 7 (can you see why?)

     y = 0 - 4x + 7 (can you see why?)

     y = -4x + 7.

    So the extra line you draw is y = -4x + 7.
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