College Algebra / Alg 153 · Atom · ~20 seconds
Horizontal and Vertical Lines
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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.
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