Horizontal and Vertical Lines
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A horizontal line has slope 0 and equation y = b; a vertical line has undefined slope and equation x = a.
Show
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.
Builds on
- Nothing — this is a starting point.
Unlocks
- Nothing yet depends on this.