Question

Is `-x+4y=-2` a direct variation equation and if so what is the constant?

Answer 1

`-x+4y=-2` is not a direct variation equation.

Explanation:

Any equation which is a direct variation must be re-arrangeable into the form: `y=cx` for some constant `c`.
That is not true of the given equation.

One way to see this is to note that `(x,y)=(0,0)` must be a valid solution for any direct variation equation.
Replacing `x` and `y` with `0`'s in the given equation:
`color(white)("XXX")-0+4(0) = 0 != -2`