If y varies directly as the square root of x an... - JAMB Mathematics 2010 Question
If y varies directly as the square root of x and y = 3 when x = 16. Calculate y when x = 64
A
12
B
6
C
3
D
5
correct option: b
y ∝ √x
y = K√x
K = y/√x = 3/√16
= 3/4
y = 3/4√x
= 3/4√64 when x = 64
= 3/4 x 8/1
= 6
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