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Chain rule partial derivative

  1. Nov 3, 2015 #1
    1. The problem statement, all variables and given/known data
    Capture.PNG

    2. Relevant equations
    Chain rule, partial derivation

    3. The attempt at a solution
    dv/dt=dv/dx*dx/dt+dv/dy*dy/dt
    dx/dt=-4t -> evaluate at (1,1) =-4
    dv/dt=-4dv/dx+4(-2)
    dv/dt=-4dv/dx-8

    How can I find the missing dv/dx in order to get a value for dv/dt? Thanks!
     
  2. jcsd
  3. Nov 4, 2015 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    Did you expand the other derivatives to see if you get additional constraints from them?
     
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