0580/23 Oct/Nov 2024, Question 19: Inverse Proportion: y = k/x
Cambridge IGCSE Mathematics 0580 · Paper 23 (Extended) · Calculator · 2 marks
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The question, in short
Given y inversely proportional to √(x + 2) with y = 3 when x = 2, find y as a formula in x.
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Solution · 2 marks
- 1y = k/√(x + 2)
- 23 = k/√(2 + 2) = k/2, so k = 6
- 3y = 6/√(x + 2)
Answer6/√(x + 2)
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