y varies directly as w2 When y 8 w 2 Find y whe... - JAMB Mathematics 2014 Question
y varies directly as w2. When y = 8, w = 2. Find y when w = 3
A
18
B
12
C
9
D
6
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Correct Option: A
(y \propto w^2)
y = kw2
8 = k(2)2
8 = k(4)
k = 8/4
k = 2
Thus y = 2w2
When w = 3, y = 2(3)2
y = 2 x 9 = 18
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