Basics
A line is a flat straight figure extending infinitely through two points. (See Line L above.)
x-axis = horizontal
x = horizontal coordinate
(x, y) = point representing horizontal and vertical coordinates on Line L
Slope refers to the steepness of a line.
m = slope
Formulas (Mathematics Formula Sheet)
slope of a line
m =
slope-intercept form of the equation of a line
y = mx + b
point-slope form of the equation of a line
y – y1 = m(x – x1)
Formulas (NOT on Mathematics Formula Sheet)
slope as change
m =
slope-intercept b
b = y – mx
standard form of the equation of a line
ax + by + c = 0