Purple Math
Purplemath: Straight Line Equations: Point Slope Form
Two very clear examples of point-slope form are given in this Purplemath lesson. One example begins with the slope and a point and the other example begins with two points. Includes interactive widget for practice determining a linear...
Texas A&M University
Wtamu Virtual Math Lab: College Algebra: Equations of Lines
This tutorial covers x & y intercepts, point-slope form, slope-intercept form, graphing, and more. Use the practice problems at the end to check your skills.
Texas A&M University
Wtamu Virtual Math Lab: College Algebra: Parallel and Perpendicular Lines
Given a line, learn how to find the equations for lines that are perpendicular and parallel to it. This tutorial offers several example graphs and problems as well as practice problems for you to work through when you're ready.