**Lines.**
A line may be determined by a *slope* and a *-intercept* .
If so, the equation of the line can be written by

**General form of a line.**
A line is ``always'' expressed in the form of a linear equation

(1) |

**Linear functions.**
A function is called a *linear function* if

(2) |

with slope and intercept . A linear function represents a line, but not always otherwise; compare (2) with (1).

Department of Mathematics