WAEC Mathematics 2018 Objective — Question 3
Question 3 of 50 from the West African Examinations Council (WAEC) Mathematics 2018 Objective paper, with the correct answer and a full explanation.
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Given that y varies inversely as the square of x. If x = 3 when y = 100, find the equation connecting x and y.
- A. yx²=300
- B. yx²=900Correct
- C. y=100x/9
- D. y=900x²
Explanation
y=k/x² → 100=k/9 → k=900, so yx²=900.
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