Partial Derivative help

[mstange89]

Partial Derivative help!

Find the first partial derivatives of f(x,y)=(4x+2y)/(4x−2y) at the point (x,y) = (2, 1).

My professor never taught us how to do this so I have no idea where to start. Any help would be appreciated.

 

[Hurkyl]

Er... you weren't taught about derivatives?

 

[mstange89]

Derivatives yes, partial derivatives with a quotient, no