GCSE Maths (Edexcel)

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Inverse Proportionality Graphs

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Ratio, Proportion and Rates of Change Ratio, Proportion and Rates of Change

Inverse Proportionality Graphs

3:33 Inverse Proportionality
Spec R10 R14
Previous Deriving Inverse Proportionality Equations Next Advanced Proportionality Equations
  • Inversely proportional variables have a reciprocal graph
  • The graph of y = 1/x has a general shape where y becomes very large when x is very small, and y becomes very small when x is very large
  • The graph gets closer and closer to the axes without ever reaching them
  • Any inversely proportional relationship will have a similar graph as long as the value of k is positive
  • To graph an inversely proportional relationship, plot the given point and then use the rules of inverse proportionality to find other points on the graph
  • Join the points with a smooth curve to complete the graph

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