how to draw ellipse in general equation?

I want to draw an ellipse and I have it's general equation.I used "ezplot" but I don't know the domain of p & t: ezplot('.1444*10^-10*p^2+11630*10^-10*t^2+47.3*10^-10*p*t-22000*10^-10*p-82.9*10^-5*t-1=0') so the figure window is empty

Answer 1

[Torsten]

http://www.wolframalpha.com/input/?i=ImplicitPlot%5B.1444*10%5E-10*p%5E2%2B11630*10%5E-10*t%5E2%2B47.3*10%5E-10*p*t-22000*10%5E-10*p-82.9*10%5E-5*t-1%3D%3D0,%7Bp,-3.5e5,4e5%7D,%7Bt,-1000,1700%7D%5D

Best wishes

Torsten.

[bardia babaei]

tnx and how did you find the domain of p &t?

[Torsten]

Trial and error.

Best wishes

Torsten.