JAMB Mathematics 2008 Objective — Question 15
Question 15 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2008 Objective paper, with the correct answer and a full explanation.
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If x-3 is directly proportional to the square of y and x=5 when y=2, find x when y=6
- A. 30
- B. 21Correct
- C. 16
- D. 12
Explanation
x-3 = ky^2. 5-3=k(2^2). k=1/2. When y=6: x-3=(1/2)(36)=18. x=21.
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