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Mathematics for IGCSE & O level - Proportion (Section 2 - No. 13)

If *y* is inversely proportional to *x*, and *y* = 8 when *x* = 2, what is *y* when *x* = 4?
1
4
8
16

Explanation

y = k/x, 8 = k/2; k = 16; y=16/x; y=16/4=4

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