1. Substituting into formulae
Example
If A = 6 x m, find A when m = 3

2. Example
If T = a + b, find the value of T when a = 7 and b = 6.

3. Example
Given P = 2m + 2n, find P when m = 5 and n = 8.

4. Example
If y = 2x + 4 work out
y when x = 5
y when x = 8

5. Example
If A = xy, find A when x = 9 and y = 7.

6. Example
Evaluate y = mx – c when m = 2, x = 7 and c = 4

7. Example
Use the formula v = u + at to find
a) The value of v when u = , a = 2 and t = 5
b) The value of u when v = 6, a = 1 and t = 4
c) The value of t when v = 12, u = 6 and a = 3.

8. Example
Given
Work out G when x = 11, y = 16 and r = 3

9. Example
If work out a when b = 10

10. Example
Use the formula y = mx + c to find
The value of m when y = 12, x = 3 and c = 3
The value of c when y = 15, m = 2 and x = 4.

11. Example
The Roberts’ family visit the Zoo. What would be the total cost for two adults and three children?
Zoo Price list
Adult price £27
Child Price £18