Mathematics for IGCSE & O level - Proportion (Section 3 - No. 5)
Given that *y* ∝ 1/*x*2. If *x* increases by a factor of 2, by what factor does *y* change?
2
1/2
4
1/4
Uitleg
Since y is inversely proportional to x^2, when x increases by a factor of 2, x^2 increases by a factor of 4, and y decreases by a factor of 4.