Consider the equation x^2/9+y^2/9=1, which is the equation of a circle. Explain what you might do in order to change this equation of each of the following:
1. an ellipse
2. a hyperbola
3. a parabola

What real life objects are physical models of an ellipse, hyperbola, and parabola?

Question

Consider the equation x^2/9+y^2/9=1, which is the equation of a circle. Explain what you might do in order to change this equation of each of the following:
1. an ellipse
2. a hyperbola 
3. a parabola

What real life objects are physical models of an ellipse, hyperbola, and parabola?

anonymous · Answer

an ellipse
change one of the denominators so they are not equal

anonymous · Answer

a hyperbola
change the plus sign to a minus sign as well

anonymous · Answer

$$\frac{x^2}{4}-\frac{y^2}{9}=1$$ for example for a hyperbola

anonymous · Answer

a parabola
get rid of one of the squares like 
$$x^2+y=1$$

anonymous · Answer

the rest of the question i would do a quick google search
planets have elliptical orbits, flashlights have parabolas, but i am just making stuff up