JAMB - Mathematics (2010 - No. 6)
If y varies directly as the square root of x and y = 3 when x = 16. Calculate y when x = 64
12
6
3
5
คำอธิบาย
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
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