# How to solve an equation with two variables in Mathematica

If I solved an example equation like |x|+|y|=1 numerically, I would to get a 90° rotated rectangle. If I was to plot the equation, it would result in an image like the following:

As an example, this is the problem I want to solve:

Sin[x] Sin[2y] + Sin[y] Sin[2x] = 0


May I get suggestions on the best method to plot the example problem achieving the same result?

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I suppose you looked in the documentation for Solve? What problem did you encounter? –  Oleksandr R. Jan 14 '14 at 14:24

ContourPlot[Abs[x] + Abs[y] == 1, {x, -2, 2}, {y, -2, 2}]

ContourPlot[Sin[x] Sin[2 y] + Sin[y] Sin[2 x] == 0, {x, -5, 5}, {y, -5, 5}, PlotPoints -> 100]