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Changing the Subject of a Formula Dr Frost

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Motivation The formula to calculate a temperature in Fahrenheit if we have the temperature in Celsius: But what if we had say the temperature in Fahrenheit, and wanted to know it in Celsius?

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Motivation If we have some value of F, we can now more easily substitute it in to give us a value for C. C is now the subject of the formula.

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Learning Objectives Be able to make a term the subject of a formula, possibly involving brackets, squared terms and square roots.

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‘Solving’ an equation Solving an equation means that we make a given variable the subject of the formula. x = ?

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Questions STP9A - Page 188 – Exercise 9D: Q1, 3, 5. – Exercise 9E: Odd questions.

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Frost Conundrum At what temperature do we get the same reading regardless of whether we use Fahrenheit or Celsius?

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Recap Make x the subject.

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Questions Rayner – page 176 – Exercise 4 – Exercise 5

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