a a\,a is directly proportional to b b\,b
When a=3a = 3a=3, b=15b = 15b=15
The relationship can be written as
a=kb a=kb a=kbwhere k k\,k is a constant.
Find the value of kkk
Hence, find the value of b b\,b when a=4a = 4a=4
164 exam-style questions on Eduqas GCSE Maths Direct and Inverse Proportion. Each one has a worked solution and a mark scheme showing where the marks go.