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Mathematics for IGCSE & O level - Proportion (Section 2 - No. 20)
In the formula *y* = *kx*
2
, if *x* is halved, by what factor does *y* change?
1/4
1/2
2
4
Explication
If x becomes x/2, then y = k(x/2)^2 = kx^2/4, so y is multiplied by 1/4.
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