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4 $begingroup$ I have two functions $f(x,y)$ and $g(x,y)$ . I wish to perform two tasks on a 2-dimensional figure: Plot the curve where each point satisfies $f(x,y)=g(x,y)$ . Mark one side of the curve with red. I tried to use Plot3D like the following myfunc[x_, y_]:= If[f[x, y] < g(x, y), 1,0]; Plot3D[myfunc[x, y], {x, 0, 10}, {y, 0, 3}] It gives what I expected, but how can I do this in a 2D plot? plotting share | improve this question edited 1 hour ago m_goldberg 87.7k 8 72 198 asked 7 hours ago