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Empty ContourPlots when using symbol with assigned equation

Why don't the first two contour plots show the equation?
POSTED BY: Jay Gourley
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Thanks, Henrik Schachner. That works. I'm reading about Evaluate now.
POSTED BY: Jay Gourley

Jay,

ContourPlot has the attribute HoldAll:

Attributes[ContourPlot]
(*  Out:   {HoldAll,Protected,ReadProtected}   *)

So, you need Evaluate:

eq1 = x^2 - y (x - 1) == 0;
ContourPlot[Evaluate@eq1, {x, -5, 5}, {y, -5, 5}]
POSTED BY: Henrik Schachner
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