Why Can't I Plot This Function in Mathematica 7?

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The discussion centers on using the Plot function in Mathematica 7 for a specific polynomial expression, 9x² + 18xy + 13y² - 4. It clarifies that the Plot function is designed for single-variable functions, while the user was attempting to plot a function of two variables. The response highlights that the ImplicitPlot function, previously available for two-variable functions, has been replaced by the ContourPlot function in Mathematica. However, it notes that ImplicitPlot would not be applicable in this case since the equation is not implicit. The user acknowledges this clarification.
cuongktv
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Hey every pro.
Please help me to check with Plot function in Mathematica 7 like this: 9x2+18xy+13y2-4
I only could Plot with "Plot3D[]", but could not get result with "Plot[]" only.
Thanks!
 
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Ok, I got it. Thank you so much!
 

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