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2 marksDirect and Inverse Variation

CSEC Mathematics · May/June 2010 · Paper 2 · Question 4(a)(ii)

When y varies directly as the square of x, the variation equation is written y = kx^2, where k is a constant. Given that y = 50 when x = 10.

Calculate the value of y when x = 30.

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Other parts of this question

  1. 4(a)(i)Find the value of k.[2 marks]
  2. 4(b)(i)Using a ruler, a pencil and a pair of compasses, construct triangle EFG with EG = 6 cm, ∠FEG = 60° and ∠EGF = 90°.[5 marks]
  3. 4(b)(ii)a)Measure and state the length of EF[2 marks]
  4. 4(b)(ii)b)Measure and state the size of ∠EFG.[2 marks]

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