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Zero slope, undefined slope, or neither?

Exercise and reference answers

Items
  1. Item
    A horizontal line
    Category
    Slope is zero
  2. Item
    A line parallel to the x-axis
    Category
    Slope is zero
  3. Item
    A vertical line
    Category
    Slope is undefined
  4. Item
    A line parallel to the y-axis
    Category
    Slope is undefined
  5. Item
    A line at 45 degrees
    Category
    An ordinary slope
  6. Item
    A line rising gently
    Category
    An ordinary slope
Categories
  1. Item
    Slope is zero
  2. Item
    Slope is undefined
  3. Item
    An ordinary slope

Explanation

The two special cases, set against ordinary lines. Source: syllabus Maths, Ch 9 Straight Lines.
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