Equations used to Explore the curves with both Negative and Positive Coefficients of the xy Term

By

Nathan Wisdom

x^2+y^2=9

x^2-(x*y)+y^2=9

x^2+x*y+y^2=9

x^2-(2*x*y)+y^2=9

x^2+2*x*y+y^2=9

x^2-(1.9*x*y)+y^2=9

x^2+1.9*x*y+y^2=9

x^2-(2.1*x*y)+y^2=9

x^2+2.1*x*y+y^2=9

x^2-(3*x*y)+y^2=9

x^2+3*x*y+y^2=9

x^2-(4*x*y)+y^2=9

x^2+4*x*y+y^2=9

x^2-(1.5*x*y)+y^2=9

x^2+1.5*x*y+y^2=9

Graph of the formula


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