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## Homework Statement

## Homework Equations

Chain rule, partial derivation

## 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!