# Directly proportional?

directly proportional? can anyone give an example of it?

thanks alot!

Pyrrhus
Homework Helper
y and x are directly proportional, A is a constant.

$$y = Ax$$

$$\frac{y}{x} = A$$

Right. This is represented as $$y\propto x$$.

thanks!

Careful. Make sure A is not a positive constant < 1. Otherwise you will get that they are inversely proportional.

cyby said:
Careful. Make sure A is not a positive constant < 1. Otherwise you will get that they are inversely proportional.

hi cyby! what you mean with that? do you mean that A must always be a positve number if not it will be inversely proportional?

Tom Mattson
Staff Emeritus