Question

Is `3x-y=0` a direct variation equation and if so what is the constant?

Answer 1

`3x-y=0` is a direct variation equation
with a constant of `3`

Explanation:

`3x-y=0`
is equivalent to `y=3x` which is one of the standard direct variation forms.

For a direct variation if `(hatx,haty)` is a solution to `3x-y=0` then `(n*hatx,n*haty)` is also a solution.
.
For example `(1,-3)` is a solution so `(13xx1,13xx(-3))=(13,-39)` is also a solution is also a solution since `3x-y=0` is a direct variation.