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If x3 varies directly as y and when x = 2, y = 28, then which of the following relations is true?1). 7x3 = 2y2). 5x2 = 4y3). 5y = 4x34). 4y = 9x2 |
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Answer» Given, x3 α y ⇒ x3 = k × y ∴ 23 = k × 28 ∴ k = 8/28 = 2/7 ⇒ 7x3 = 2y |
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