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Sticky Note
The slope of vertical line is?
  1. Defined
  2. Undefined
  3. 0
  4. None of these
Explanation

Slope m = (y₂ - y₁)/(x₂ - x₁)

For a vertical line, x stays the same for all points → x₂ - x₁ = 0

So m = something / 0 → division by zero = undefined/infinite


Last verified on 08-06-2026

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