Equations used to Explore the Curves

by

Nathan Wisdom

x^2+y^2=9

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

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

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

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

x^2+0.9*x*y+y^2=9

x^2+0.8*x*y+y^2=9

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

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

Graph of the formula


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