Chapter 7.3
Special case of linear equations: Horizontal lines
What You'll Learn
Recognize horizontal lines by identifying when all y-coordinates are identical
Write equations for horizontal lines in the form y = b
Understand that horizontal lines have a slope of zero
Determine horizontal line equations from coordinate pairs or single points
What You'll Practice
1
Writing equations from pairs of points with matching y-values
2
Identifying horizontal line equations passing through given points
3
Recognizing when coordinate pairs form horizontal lines
Why This Matters
Understanding horizontal lines is essential for graphing functions and analyzing real-world situations where values remain constant, like temperature plateaus or fixed costs. This concept builds your foundation for more complex linear equations and helps you quickly identify special cases in algebra and coordinate geometry.
Before You Start — Make Sure You Can:
This Unit Includes
3 Video lessons
Practice exercises
Learning resources
Skills
Horizontal Lines
Linear Equations
Slope
Coordinate Geometry
y-intercept
