The cost of the pencils (C) is directly proportional to the number of pencils (n). When the proportionality sign (∝) is replaced with an equal sign (=), the equation is \(x = k y\). The constant value ...

This graph shows that the cost of cheese (𝒚) is directly proportional to the amount of cheese (𝒙).

What are ratio and proportion? In the maths curriculum, ‘ratio and proportion’ are key concepts that help pupils understand and solve problems involving relative sizes and quantities. A ratio is a way ...