**Line = Flat Straight Figure Extending Infinitely Through Two Points**

Basics

A line is a flat straight figure extending infinitely through two points. (See Line L above.)

x-axis = horizontal

y-axis = vertical

x = horizontal coordinate

y = vertical coordinate

(x, y) = point representing horizontal and vertical coordinates on Line L

(o, b) = y-intercept = point where Line L crosses the y-axis

m = slope

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Formulas (provided by Mathematics Formula Sheet)
**slope of a line

slope-intercept form of the equation of a line

point-slope form of the equation of a line

**
Formulas (NOT provided by Mathematics Formula Sheet)
**slope as change

slope-intercept b

standard form of the equation of a line