Mathematics for IGCSE & O level - Proportion (Section 1 - No. 38)
If y varies inversely as x, what happens to y if x is tripled?
y is tripled
y is halved
y is divided by 3
y stays the same
Giải thích
If x becomes 3x, and y is inversely proportional to x, then y = k/x becomes k/(3x) which is y/3.