The constant of proportionality

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In a mathematical equation that relates two variables, the constant of proportionality determines the relationship between the two variables. It is represented by the letter k and remains constant throughout the equation.

For example, in the equation y = kx, the constant of proportionality is k. It determines how much y changes for a given change in x. If k is positive, then y increases as x increases, and if k is negative, then y decreases as x increases.

The constant of proportionality can also be referred to as the proportionality constant, the coefficient of proportionality, or simply the constant factor.