Let's take as example a linear function of the form: y = kx. Where, k is the constant of proportionality. Therefore, the proportionality constant is the point: (x, kx) Generically it is always the point: (x, k * f (x)) Where, f (x) is a function proportional to x. answer: The constant of proportionality is always the point (x, k * f (x)), where k is the constant of proportionality.
