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Slope of a Line
Graphs
Slope-Intercept Form
Point-Slope Form
Parallel Lines
Perpendicular Lines
Practice Problems
  GRAPHS
Note: When x1 = x2, line l will always be a vertical line and the slope (m) of l will always be undefined since x1 – x2 = 0 and division by 0 is undefined.

Thus, when there is no slope, you will always have a vertical line and the line will contain the x-coordinates of the points as shown.
No slope!
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