Proportionality (mathematics) - Direct Proportionality

Direct Proportionality

Given two variables x and y, y is directly proportional to x (x and y vary directly, or x and y are in direct variation) if there is a non-zero constant k such that

The relation is often denoted, using the ∝ symbol, as

and the constant ratio

is called the proportionality constant or constant of proportionality.

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