1.

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

Answer»

Given, x3 α y

⇒ x3 = k × y

∴ 23 = k × 28

∴ k = 8/28 = 2/7

⇒ 7x3 = 2y


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