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Sep 7, 2017

$y=4x$ is a direct variation with a constant of $4$

Explanation:

Any function that can be written in the form:
$color(white)("XXX")y=color(magenta)cx$ with a constant $color(magenta)c$
is a direct variation with a constant of $color(magenta)c$

Sep 7, 2017

$y=4x" is direct variation",k=4$

Explanation:

$"the equation for direct variation is"$

$•color(white)(x)y=kxlarrcolor(blue)" k is the constant of variation"$

$y=4x" is in this form with "k=4$

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