Why is $y = 2 x - 1$ $y=2x-1$ not a direct variation?

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Why is $y = 2 x - 1$ $y=2x-1$ not a direct variation?

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Answer 1 · 2018-03-16T13:42:33

$see explanation$ $"see explanation"$

Explanation:

$the equation representing direct variation is$ $"the equation representing direct variation is"$

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

$which means it passes through the origin$ $"which means it passes through the origin"$

$y = 2 x - 1 is not in this form so does not represent$ $y=2x-1" is not in this form so does not represent "$
$direct variation$ $"direct variation"$

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Why is $y = 2 x - 1$ $y=2x-1$ not a direct variation?

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