This web page constructs PostScript or PDF plots of the solutions to equations on two variables. Unlike other plotters, it can handle general equations, not just functions. It can also handle inequalities, and it can plot multiple equations at once, separated by commas. Some examples of interesting equations to plot:
x^2 * y^2 = 1 x^3 + y^3 = 3xy x^y = y^x (r-1/2)^5 = 4yx^3 - 4xy^3 ln r = sin 4x^2 + cos 5y^2 + x/4 ((xy(x-y)(x+y)(x^2+y^2-4))^2 - 1) < 1 x+y = sqrt((exp x + exp(-x))/2 - 1) y = 3 * x * sin(5/r) |x^2| <= floor(y*10)/5 (x^2 - y^2) mod 1 = 0.5