In this graph, 𝑥 and 𝑦 are directly proportional. This means that when 𝑥 doubles, 𝑦 also doubles, and when 𝑥 triples, so does 𝑦. In fact, for all coordinates on this line, you could multiply or ...

There is a direct proportion between two values when one is a multiple of the other. For example, \(1\text{cm} = 10\text{mm}.\) To convert \(\text{cm}\) to \(\text{mm}\), the multiplier is always 10.

A worksheet on direct proportion. The problems require to calculate the constant of proportionality using the given information and then use the resulting equation to calculate the value of the one of ...

These lessons have been made to go with the IGCSE course but could easily be adapted. Pupils learn how to write equations for quantities linked by Direct or Inverse Proportion. If you like this ...