College Algebra / Unit 3 Alg 153 short lesson, about 20 seconds
Horizontal and Vertical Lines
Captions available
The idea
A horizontal line has slope 0 and equation y = b; a vertical line has undefined slope and equation x = a.
In practice
Through (3, 1) and (3, 5), the run is 0 — the slope formula divides by zero, so the slope is undefined and the line is x = 3.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
Unlocks
- Nothing yet depends on this.
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