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Mathematics for IGCSE & O level - Proportion (Section 3 - No. 1)

If *y* ∝ √*x*, and *y* = 6 when *x* = 9, find *y* when *x* = 16.
4
8
12
16

Explication

y= k√x; 6 = k√9; 6 = 3k; k=2. Then y=2√x ; y=2√16 = 8

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