This applet displays the graph of f(x,y) along with its tangent plane at (p,q). 

function:        f(x,y) =                     point: (p,q) =      ,  
Enter plot settings. The y settings can be either numbers or functions of x:
x min:       y min(# or g(x) ):      Grid (x) :    Axes:
x max:    y max(# or g(x) ): Grid (y) :
  Click desired option to create the plot: