Horizontal & Vertical Lines

Horizontal Lines

  1. must have the same y coordinate as its y intercept
  2. the x axis is the special example of a horizontal line y = 0
  3. all points on horizontal line take the form (x, y intercept)
  4. all horizontal lines that are not the x axis are parallel to the x axis
  5. all horizontal lines are perpendicular to all vertical lines
  6. If a horizontal line is NOT the x axis, then that horizontal line does NOT have an x intercept
  7. All horizontal lines have a slope of 0

Vertical Lines

  1. must have the same x coordinate as its x intercept
  2. the y axis is the special example of a vertical line x = 0
  3. all points on vertical line take the form (x intercept, y)
  4. all vertical lines that are not the y axis are parallel to the y axis
  5. all vertical lines are perpendicular to all horizontal lines
  6. If a vertical line is NOT the y axis, then that vertical line does NOT have an y intercept
  7. All vertical lines have a slope that is undefined
  8. All vertical lines ARE NOT FUNCTIONS