WeBWorK using host: https://webwork-ptx.aimath.org, format: simple seed: 401

A conic can be a point, a line, a pair of lines, or no graph at all.

The coefficients $D\text{,}$ $E\text{,}$ and $F$ determine the of the conic.

The graph is a if one of $A$ or $C$ is zero.

If $A = C$ (and $B=0$ ), the graph is a .