Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Gordon Scott has been an active investor and technical analyst or 20+ years. He is a ...

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 ...