1. Direct proportion? n = the number of cans of coke you buy from a machine. C = the total cost of the cans. C is directly proportional to n. n C C = kn

2. Direct proportion? d = the diameter of a circle. C = the Circumference of the circle. C is directly proportional to d. d C C = kd

3. t v Direct proportion? t = the time taken to travel a distance of 100m. v = the speed at which you travel. t is inversely proportional to v t = k / v

4. t v Direct proportion? t = the time taken to build a wall. N = the number of builders. t is inversely proportional to N t = k / N

5. Inverse proportion T is inversely proportional to m. If T = 12 when m = 1, find a)T when m=2 b)T when m = 24

6. Inverse proportion T varies inversely as (y - 2). If e = 12 when y = 4, find a)e when y=6 b)y when e = ½