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

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Answer 1 · 2017-10-22T20:34:26

It is not a direct variation. See explanation.

An equation is a direct variation only if it can be transformed to

$y = a x$ $y=ax$

In such equation the parameter $a$ $a$ is the variation constant.

The given equation is not a direct variation because it has an aditional parameter $4$ $4$ .