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Homework Help: Parameterize part of a Parabola

  1. Jan 13, 2012 #1
    1. The problem statement, all variables and given/known data
    Find a parametric equation for a part of a parabola.

    Given:
    y=-2x2
    initial point: (-2,-8)
    terminal point: (1,-2)



    2. Relevant equations
    x(t)=a+t(c-a)
    y(t)=b+t(d-b)


    3. The attempt at a solution
    x(t)=-2+t(1-(-2))
    =3t-2
    y(t)=-8+t(-2-(-8))
    =6t-8

    I'm not sure where to go from there.
     
  2. jcsd
  3. Jan 13, 2012 #2

    jedishrfu

    Staff: Mentor

    dont you need to plug the x(t) into the y=-2x^2 to get y(t)
     
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