- if x and y are in direct proportion, then y = kx
- if x and y are in inverse proportion, then y = k/x
Question 1
- Example
- A = kB
- 12 = k x 3
- k = 12/3
- k = 4
- A = 4B
Inverse proportion example (question 1)
- T = k/N
- 30 = k/5
- k = 30 x 5
- k = 150
- T = 150/ N
GCSE Maths | Direct and Inverse Proportion