Slope of a Line

The slope of a straight line, vertical and horizontal lines are explored interactively using an html 5 application.

Use the application below to explore the concept of a slope.

Formula of the Slope m

Given two points A(xA , yA) and B(xB , yB), the slope m of the line through the two points is given by the formula:
m = (YB - YA) / (XB - XA)

Interactive Tutorial

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  1. Use the mousse, click press and drag points A and B slowly, determine their coordinates and use the formula of the slope of a line to calculate the slope of the line through the two points.
  2. Keep A in a fixed position and change the position of point B so that the line through AB is parallel to the x axis. Calculate the slope.
  3. Keep A in a fixed position and change the position of point B so that the line through AB is parallel to the y axis. Calculate the slope.
  4. Keep A in a fixed position and change the position of point B so that the line rises. Calculate the slope. Is the slope positive, negative or equal to zero?
  5. Keep A in a fixed position and change the position of point B so that the line falls. Calculate the slope. Is the slope positive, negative or equal to zero?


More References and Links

Easy to use calculator to find slope and equation of a line through two points.Two Points Calculator
Another calculator to find
slope, x and y intercepts given the equation of a line.Find Slope and Intercepts of a Line - Calculator