If y ∝ 1/x and y = 15 when x = 3 find x when y = 5?
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- 7
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Explanation
y ∝ 1/x → y = k/x
When x = 3, y = 15:
15 = k/3 → k = 45
So y = 45/x
When y = 5:
5 = 45/x → x = 45/5 = 9
Last verified on 07-05-2026
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