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Algebra

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Direct Variation Definition

ALGEBR-AFVGEX

Which of the following is a mathematical expression of the sentence "$y$ varies directly with $x$"? Select ALL that apply.

A

$y=mx+b$

B

$y=mx$

C

$y=kx$

D

$y-y_1=m(x-x_1)$

E

None of these