2014
Mathematics
JAMB
y varies directly as w2. When y = 8, w = 2. Find y when w = 3
A.
18
B.
12
C.
9
D.
6
Correct Answer: 18
Explanation
y ∝ w2 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
y ∝ w2 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 = 18THIS WEEK's
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