Results 1 to 3 of 3

Math Help - exam in a couple hours... vector field question

  1. #1
    Newbie
    Joined
    Oct 2009
    Posts
    24

    exam in a couple hours... vector field question

    I dont thoroughly understand this... I know I shouldve seeked more help on campus but I got wrapped up in studying for my other exams.

    given
    dx/dt = (-1/2 3/2 ) (x)
    dy/dt (3/2 -1/2 ) (y)

    first told to sketch vectors on line y = 0

    -1/2x + 3/2y -1/2x
    3/2 x -1/2y = 3/2x

    How can I tell slope and direction of vectors from this?

    Here is the link with this problem on it (example 2)

    http://www.math.umass.edu/~norman/33...1lastnotes.pdf
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Jester's Avatar
    Joined
    Dec 2008
    From
    Conway AR
    Posts
    2,355
    Thanks
    35
    Quote Originally Posted by plopony View Post
    I dont thoroughly understand this... I know I shouldve seeked more help on campus but I got wrapped up in studying for my other exams.

    given
    dx/dt = (-1/2 3/2 ) (x)
    dy/dt (3/2 -1/2 ) (y)

    first told to sketch vectors on line y = 0

    -1/2x + 3/2y -1/2x
    3/2 x -1/2y = 3/2x

    How can I tell slope and direction of vectors from this?

    Here is the link with this problem on it (example 2)

    http://www.math.umass.edu/~norman/33...1lastnotes.pdf
    On the line y = 0 then

     <br />
\frac{dx}{dt} = - \frac{1}{2}x\; \text{and} \; \frac{dy}{dt} = \frac{3}{2}x<br />
.

    Picking values of x say x = -2, -1, 0, 1, 2 will give both \frac{dx}{dt} and \frac{dy}{dt} or dividing \frac{dy}{dx}.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Oct 2009
    Posts
    24
    thanks for the help =)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Math Exam, due in about 18 hours
    Posted in the Calculus Forum
    Replies: 6
    Last Post: April 6th 2010, 09:00 PM
  2. Replies: 1
    Last Post: December 18th 2009, 02:07 AM
  3. Finding basis test within a couple of hours!
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: September 30th 2009, 08:59 AM
  4. Linear Algebra please help.Exam in a couple of hours.
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: June 20th 2008, 03:35 AM
  5. Help for exam in 6 hours
    Posted in the Calculus Forum
    Replies: 1
    Last Post: November 28th 2007, 07:12 PM

Search Tags


/mathhelpforum @mathhelpforum