# Graph of the Function with Two Variables

Suppose we are given equation with two variables f(x,y)=0. If we draw all its solutions on coordinate plane, then we obtain some set of points on plane. This set is called graph of the equation f(x,y)=0.

For example, graph of the equation y-x^2=0 is a parabola y=x^2; graph of the equation y-x=0 is line y=x (bisector of First and Third Quadrants). Graph of the function sqrt(x-1)+sqrt(y-2)=0 is one point (1;2), because coordinates of only this point satisfy equations.