# Question #363c9

Jan 29, 2016

$Y \propto X$ with a proportionality constant of 2 means $Y = 2 X$

#### Explanation:

We can write the statement "Y is proportional to the value of X ", which means that if X is double, Y is also doubled etc, as follows:

$Y \propto X$
Y is proportional to X

To convert a proportionality relationship to an equation, we need some constant or coefficient, which we would write as:

$Y = k X$, where $k$ is the proportionality constant.

In this case, $k$ is 2, so

$Y = 2 X$