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Using Formulae

Using Formulae. By the end of the lesson, you should have a good understanding of: The usefulness of formulae How to produce a formula How to rearrange formulae to suit a situation. Taxi Fare. A taxi-driver charges a fixed rate of £2 per journey plus 50p per mile .

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Using Formulae

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  1. Using Formulae • By the end of the lesson, you should have a good understanding of: • The usefulness of formulae • How to produce a formula • How to rearrange formulae to suit a situation

  2. Taxi Fare A taxi-driver charges a fixed rate of £2per journey plus 50p per mile. How much does it cost to travel 10 miles? £2 + £0.50 x 10 = £7 Can you produce a formula for the cost of travel? c = 2 + 0.5d (where c is the cost in £ and d is the distance in miles)

  3. Taxi Fare A taxi-driver charges a fixed rate of £2per journey plus 50p per mile. How far can you travel for £10? (£10 - £2) / £0.50 = 16 miles Can you produce a formula for the cost of travel? d = (c - 2) / 0.5 or: d = 2(c – 2) (where c is the cost in £ and d is the distance in miles)

  4. Taxi Fare A taxi-driver charges a fixed rate of £2per journey plus 50p per mile. c = 2 + 0.5d . c – 2 = 0.5d 2(c – 2)= d . # Changing the subject

  5. 1) 2) 3) 4) a=, b=, c= m1=, m2=, r= v=, u=, a=, s= u=, a=, t=

  6. ms-2 ms-1 ms-1 m m2s-2 m2s-2 ms-2m In a formula, the dimension of the sides is always the same

  7. 1 m s ms-2 s _m_ ms-2

  8. m s ms-2 ms-1 s

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