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If y  \(\alpha\)  x\(^2\) and y = 1\(\frac{1}{4}\) when x = 4, find the value of...

Mathematics
WAEC 2005

If y  \(\alpha\)  x\(^2\) and y = 1\(\frac{1}{4}\) when x = 4, find the value of y when x = \(\frac{1}{2}\)

  • A. \(2\frac{1}{2}\)
  • B. 5
  • C. 10
  • D. 80
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Correct Answer: Option D
Explanation

y \(\propto x^2\), y = 1\(\frac{1}{4}\), x = 4

y = \(\frac{\text{k}}{x^2}\) 

k = y x\(^2\) = \(\frac{5}{4}\) x 4\(^2\) = 20

y = \(\frac{20}{x^2}\) =  \(\frac{20}{x^2}\) = \(\frac{20}{(\frac{1}{2})^2}\)

= \(\frac{20}{\frac{1}{4}}\) = 20 x 4 = 80

 


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now