2012
Mathematics
JAMB
If y varies directly as √n and y = 4 when n = 4, find y when n = 1(7/9)
A.
√17
B.
4/3
C.
8/3
D.
2/3
Correct Answer: 8/3
Explanation
y ∝√n y = k√n when y = 4, n = 4 4 = k√4 4 = 2k k = 2 Therefore, y = 2√n y = 2√(16/9) y = 2(4/3) y = 8/3
y ∝√n y = k√n when y = 4, n = 4 4 = k√4 4 = 2k k = 2 Therefore, y = 2√n y = 2√(16/9) y = 2(4/3) y = 8/3THIS WEEK's
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