Partial Derivative

[CatchThis2]

Find the first partial derivative of: f(x,y) 3x-2y/3x+2y at the point (2,2)


f/x (2,2)=

f/y (2,2)=

Would appreciate if someone could get the answer to this problem because I'm lost.

 

[galactus]

As I showed in the other post, when differentiating w.r.t x, hold y and z constant. When differewntiating w.r.t y, hold x and z constant. Then, sub in the given values.

If it helps, sub 1 in for y and z and then differentiate w.r.t x. Maybe that will help you see it better. Remember, the derivative of a constant is 0.