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
Direct proportion?d = the diameter of a circle.
C = the Circumference of the circle.
C is directly proportional to d.
d
C
C = kd
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
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
Inverse proportionT is inversely proportional to m.If T = 12 when m = 1, finda) T when m=2b) T when m = 24
kT
m
121
k 12k
12T
m
12) 6
2a T
12) 0.5
24b T
Inverse proportionT varies inversely as (y - 2).If e = 12 when y = 4, finda) e when y=6b) y when e = ½
( 2)
ke
y
122
k 24k
24
( 2)e
y
24) 6
(6 2)a e
241) 2 ( 2)b
y
50y
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