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Changing the Subject of a Formula Dr Frost. Motivation The formula to calculate a temperature in Fahrenheit if we have the temperature in Celsius: But.

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Presentation on theme: "Changing the Subject of a Formula Dr Frost. Motivation The formula to calculate a temperature in Fahrenheit if we have the temperature in Celsius: But."— Presentation transcript:

1 Changing the Subject of a Formula Dr Frost

2 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?

3 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.

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

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

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

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

8 Recap Make x the subject.

9 Questions Rayner – page 176 – Exercise 4 – Exercise 5


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