GCSE Maths (Edexcel)

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Perpendicular Linear Graphs

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Algebra Graphs

Perpendicular Linear Graphs

4:40 Using and Interpreting Straight Line Graphs
Spec A9
Previous Parallel Linear Graphs Next Line with a Certain Gradient
  • Perpendicular lines are at a right angle to each other
  • Perpendicular lines meet at 90 degrees
  • The gradients of perpendicular lines are negative reciprocals of each other
  • The formula for finding the gradient of a perpendicular line is M1 = -1/M2
  • The product of the gradients of perpendicular lines is always -1
  • To find the equation of a line perpendicular to a given line, find the gradient using the formula M1 = -1/M2 and then use the y-intercept to find the equation

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