IGCSE Maths Edexcel A 4MA1

set up problems involving direct or inverse proportion and relate algebraic solutions to graphical representation of the equations

To include only the following:

$y ∝ x, y ∝ \dfrac{1}{x}$

$y ∝ x^2, y ∝ \dfrac{1}{x^2}$

$y ∝ x^3, y ∝ \dfrac{1}{x^3}$

$y ∝ \sqrt{x}, y ∝ \dfrac{1}{\sqrt{x}}$