4024/11 May/Jun 2022, Question 21: Inverse Proportion: y = k/x
Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 2 marks
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The question, in short
y is inversely proportional to (x + 1)². Given y = 2 when x = 3, find y when x = 9.
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Solution · 2 marks
- 1y = k/(x + 1)²
- 22 = k/(3 + 1)² → k = 32
- 3y = 32/(9 + 1)² = 32/100 = 0.32
Answer0.32 or 32/100
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