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A variable y is inversely proportional to x2, when y = 10, x = 2….

A variable y is inversely proportional to x2, when y = 10, x = 2. What is y when x = 10?
  • A.
    2
  • B.
    4
  • C.
    100
  • D.
    0.4
  • E.
    0.1
Correct Answer: Option D
Explanation

y (alpha) (frac{1}{x^2})
y = (frac{k}{x^2})
k = x2y
= (2)2 x 10
= 40
y = (frac{40}{x^2})
= (frac{40}{(10)^2})
= (frac{40}{100})
= 0.4