Proportional Relationships (AQA A-Level Mathematics): Flashcards

Two quantities with constant ratio

$y = kx$

Constant of proportionality

$k$ (constant)

Straight line through origin $(0,0)$

Constant of proportionality $k$

$y = \frac{k}{x}$

$k = xy = 8 \times 2 = 16$

$k = \frac{y}{x}$

Check if straight line through origin