Is $x = - 7$ $x=-7$ a direct variation and if so what is the constant?

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Is $x = - 7$ $x=-7$ a direct variation and if so what is the constant?

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Answer 1 · 2015-06-01T22:47:39

$x = - 7$ $x=-7$ is not a direct variation.

It is not a variation of any kind. $x$ $x$ is a constant.

A necessary (but not sufficient) condition for an equation to be a direct variation is that the equation have two variables.

Even then the equation would not be a direct variation unless it could be expressed in the form
$XXXXX$ $color(white)("XXXXX")$ $y = c \cdot x$ $y=c*x$ for some constant $c$ $c$
(of course the letters $y$ $y$ and $x$ $x$ could be replaced by any other two symbols as the variables).

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Is $x = - 7$ $x=-7$ a direct variation and if so what is the constant?

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Is $x = - 7$ $x=-7$ a direct variation and if so what is the constant?