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Inverse Proportion

𝑥 varies inv...

Question

𝑥 varies inversely as 𝑦, and when 𝑥 = 15, 𝑦 = 10. Then, if 𝑥 = 20, 𝑦 = _____.

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Solution

$15 \times 10 = 20 \times y y = \frac{15 \times 10}{20} y = 7.5$

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$x$ varies inversely as $y$ , when $x = 15$ then $y = 10$ , if $x = 20$ then $y = ?$

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