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JAMB Mathematics 2021 Objective — Question 9

Question 9 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2021 Objective paper, with the correct answer and a full explanation.

9. A variable y is inversely proportional to x², when y = 10, x = 2. Find y when x = 10 (a) 0.4 (b) 4 (c) 0.1 (d) 1

A. 0.4Correct
B. 4
C. 0.1
D. 1

Explanation

y = k/x², so k = yx² = 10(2²) = 40. When x = 10, y = 40/100 = 0.4.

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