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when asked to identify an equation as a parabola, hyperbolas, ellipses, circles, straight lines, or none of the above, how can i deduce which is which?

the problems given are:

2x^2+2y^2=9 (im pretty sure this one's a circle, just by graphing it, but id like confirmation)

x^2=16-4y^2

x^2/16 + y/25 =1

3x^2 =7 + 3y^2

x/16 + y/25 = 1

x^2 = 16 - (y-3)^2

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# Homework Help: Identifying equations as parabola, hyperbolas, ellipses, circles, straight lines?

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