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8. Rational Expressions and Equations - 2! 2부

8. Rational Expressions and Equations / Direct & Inverse Variation / 문제 7

문제 7

The phrase " $y$ varies directly as $x$ " in a word problem signals which mathematical model should be used?

A

$y = k x$

B

$y = k x + b$

C

$y = \frac{k}{x}$

D

$y = k x^{2}$