0580/22 Feb/Mar 2022, Question 19: Inverse Proportion: y = k/x
Cambridge IGCSE Mathematics 0580 · Paper 22 (Extended) · Calculator · 3 marks
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The question, in short
Given that y varies inversely with the square root of x + 4, and y = 2 when x = 5, work out the value of y at x = 77.
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Solution · 3 marks
- 1y = k/√(x + 4)
- 22 = k/√9, so k = 6
- 3y = 6/√(77 + 4) = 6/9 = 2/3
Answer2/3
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