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Math Help - quick algebric question...important!

  1. #1
    KAS
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    quick algebric question...important!

    Hi everyone..I have a question which was troubling me somwhow..
    when I try to sketch the functions on a graph, I keep on getting lines which don't cut each other..
    this is the question:

    On a graph, plot the line y = 80 + 10x and y = 34x x2. Mark clearly the y-intercept, x-intercepts, x-axis and y-axis.
    Find the values of x where the two curves intersect.

    Appreciate your responses...
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by KAS View Post
    Hi everyone..I have a question which was troubling me somwhow..
    when I try to sketch the functions on a graph, I keep on getting lines which don't cut each other..
    this is the question:

    On a graph, plot the line y = 80 + 10x and y = 34x x2. Mark clearly the y-intercept, x-intercepts, x-axis and y-axis.
    Find the values of x where the two curves intersect.

    Appreciate your responses...
    For the second equation, do you mean y=34-x^2? If so, the two functions are graphed like this:




    If not, then you probably mean y=34-2x. The graph of the two lines is this:



    Can you take it from here and complete the problem?
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  3. #3
    KAS
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    aha thanx a lot
    I'll try ask my tutor if the function he gave was wrong or not..
    n then will c ..
    but if it was the first graph, does that mean that the intersection will be equal to zero?
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  4. #4
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    if you write out a table of values for y=34x-x^2 then plot you should find a solution graphically.

    x -3, -2, -1, 0, 1, 2, 3,
    y -111, -72, -35, 0, 33, 64, 93

    since

    80 + 10x = 34x - x^2

    x^2 - 24x + 80 = 0

    (x-4)(x-20) = 0

    x = 4 and 20 (x,y) = (4,120) and (20,280)
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  5. #5
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    Quote Originally Posted by Chris L T521 View Post
    For the second equation, do you mean y=34-x^2? If so, the two functions are graphed like this:




    If not, then you probably mean y=34-2x. The graph of the two lines is this:



    Can you take it from here and complete the problem?
    Dear chris hi,

    The equations which you wrote them are not correct ... they are :
    y=34x-2x
    or
    y=34x-x^2 ..

    bye
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