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Determien the resulting function of the line with points (1,2) and (3,3) and

  1. Jul 26, 2009 #1
    Determien the resulting function of the line with points (1,2) and (3,3) and....

    1. The problem statement, all variables and given/known data


    hi guys how are you, i am having a little trouble solving the question adn was wondering if some of you could give me a hand?

    Determine the resulting function of the line with points (1,2) and (3,3) and f(x) = 2x^2 + 9 intersect?

    2. Relevant equations



    3. The attempt at a solution

    Now idk how to solve this as its been a while since i did any math but i tried to put it in to an equation of a line and i got y=1/2x+3/2 but i know thats not right as its for an equation of a line =/. I know i need to use the two points to make an equation and then do this

    equation = 2x^2 + 9 but i dont know how to solve the two points and get an equation.
     
  2. jcsd
  3. Jul 26, 2009 #2

    jgens

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    Re: Determien the resulting function of the line with points (1,2) and (3,3) and....

    Sorry if I'm being obtuse, but are trying to find the intersection between the line with points (1,2) and (3,3) and the function f(x) = 2x2 + 9? If so, you've gotten the equation for the line correct, now all you would need to do is solve for the intersections. If I've misinterpretted the question, hopefully you wouldn't mind clarifying for me.
     
  4. Jul 26, 2009 #3
    Re: Determien the resulting function of the line with points (1,2) and (3,3) and....

    I am trying to find the intersection so i guess i am right. So i woudl do this right?

    1/2x + 3/2 = 2x^2 + 9

    and that would result to

    -2x2 + 1/2x + 21/2 = 0

    Is this correct? Also could you see if this is correct as well?

    I am given a y-intercept of 0 and a point of (2,2) and the equation of the line i got is this

    y = 1x + 0

    is that correct?
     
    Last edited: Jul 26, 2009
  5. Jul 26, 2009 #4

    jgens

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    Re: Determien the resulting function of the line with points (1,2) and (3,3) and....

    Well, your new quadratic equation isn't quite right (check the algebra)! The equation that you should get never intersects the x-axis. What does this suggest?
     
  6. Jul 26, 2009 #5
    Re: Determien the resulting function of the line with points (1,2) and (3,3) and....

    why not? whats wrong with it? which one are u referring too?
     
  7. Jul 26, 2009 #6
    Re: Determien the resulting function of the line with points (1,2) and (3,3) and....

    ohh i think you are right, should it be - 22 + 1/2x - 15/2 ??
     
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