Proportion (OCR GCSE Maths): Flashcards

Relationship between two variables where one changes in a specific way as the other changes

As one variable increases, the other also increases

As one variable increases, the other decreases

$\propto$

$y \propto x$ or $y = kx$

$y \propto x^2$ or $y = kx^2$

$y \propto x^3$ or $y = kx^3$

$y \propto \frac{1}{x}$ or $y = \frac{k}{x}$

$y \propto \frac{1}{x^2}$ or $y = \frac{k}{x^2}$

Straight line through origin $(0,0)$

Hyperbola approaching axes but never touching them

$k$