Hi

Re: reply  4X^2+4Y^2=16 

 x^2 + y^2 = 4    | II.  circle: C(0,0) radius 2 

x^2/16+ y^2/4=1  Ellipse

Need to be familiar with various standard forms:

I.The standard form of a Parbola is  

II.Standard Form of an Equation of a Circle is 

III. Standard Form of an Equation of an Ellipse is 

IV.Standard Form of an Equation of an Hyperbola is 

  OR     

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