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JAMB 2017 · UTME (set 2) · Q25

yy is inversely proportional to xx, and y=6y = 6 when x=7x = 7. Find the constant of the variation.

Worked solution (try it first)
  1. y=kxy = \dfrac{k}{x}, so the constant is k=xyk = xy.
  2. k=7×6=42k = 7 \times 6 = 42, option B.

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