OpenStax, Elementary Algebra 2e §8.9 Use Direct and Inverse Variation · Review Exercise 143 · Algebra · Rational expressions

Use Direct and Inverse Variation · Review Exercise 143

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If $y$ varies directly as $x$ , when $y = 9$ and $x = 3$ , find $x$ when $y = 21.$

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OpenStax, Elementary Algebra 2e · §8.9 Use Direct and Inverse Variation · Review Exercise 143

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Checked against the answer in OpenStax, Elementary Algebra 2e.