4024/11 May/Jun 2021, Question 19: Proportion to Powers of x
Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 2 marks
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The question, in short
y is proportional to (x − 1)². Given y = 18 when x = 4, find y when x = 6.
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Solution · 2 marks
- 1y = k(x − 1)²
- 218 = k × 3², so k = 2
- 3y = 2 × (6 − 1)² = 2 × 25 = 50
Answer50
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