Proportional Relationships (Edexcel A-Level Mathematics): Flashcards

It maintains a constant ratio between two quantities.

$y = kx$, where $k$ is the constant of proportionality.

It remains constant for all pairs of $x$ and $y$ values.

A straight line through the origin $(0,0)$.

It represents the constant of proportionality $k$.

It would cost £4, maintaining the same ratio.

Speed is proportional to distance if time is constant.

Calculate the constant of proportionality $k$.

Ensure the graph is a straight line through the origin.

$k = y/x = 10/2 = 5$.