GCSE Maths (Edexcel)

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Ratio as a Function

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

Ratio as a Function

4:50 Using Ratios
Spec R8
Previous Ratio as a Fraction Next Introduction to Percentages
  • Ratios can be represented by algebraic variables
  • Algebraic variables can represent values that can change or are unknown
  • The ratio can be used to derive a linear function relating the variables
  • The linear function can be found by multiplying one variable by the other number in the ratio
  • The derived equation can be used to find the value of one variable in terms of the other
  • An example is given of a flower shop using a ratio of roses to lilies in their bouquets
  • The steps to derive a function relating the variables are explained
  • The function is rearranged to find the number of roses using the number of lilies

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