How do you identify the following equation x2+y2=16 as that of a line, a circle, an ellipse, a parabola, or a hyperbola.?

1 Answer
Mar 25, 2016

The equation is that of a circle

Explanation:

First, move all terms on 1 side of the equation...
The equation will be in the form

ax2+by2+cx+dy+e=0

If both a and b are 0, then we are dealing with a line.
If either a or b is 0 (but not both), then we are dealing with a parabola.
If a and b have different signs, then we are dealing with a hyperbola
If a and b are equal, then we are dealing with a circle
If a and b have the same signs but with different absolute value, then we are dealing with an ellipse