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Mathematics for IGCSE & O level - Proportion (Section 2 - No. 39)
If *y* varies directly as the square root of *x*, and *y* = 6 when *x* = 4, find *y* when *x* = 9.
3
6
9
12
Explication
y=k√x, 6=k√4; k=3. y=3√x; y=3√9=9
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