Algebra › Section C · Graphs and functions › Topic C.3
Equations of lines, parallel and perpendicular
A line is fixed the moment you know its slope and one point on it. This topic turns that fact into the standard forms used to write equations, and reads the slopes that tell lines apart as parallel or perpendicular.
In this topic
- Describing a line exactly
- Slope-intercept form
- Point-slope form
- From two points to an equation
- Worked example: a two-point line
- Parallel lines
- Perpendicular lines
- Worked example: a perpendicular line
- Lines as models: a repair bill
- Common mistakes to avoid
- Key takeaways
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