Ratio & ProportionAQAEdexcelOCRWJEC

Proportion Graphs

Revise Proportion Graphs in Ratio & Proportion for GCSE Mathematics with 14 exam-style questions and 4 flashcards. Use the notes, sample questions, and flashcards below to connect this topic to the rest of your GCSE revision plan.

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What Is Direct Proportion?

Introduction 2

Key Facts

Key Facts 3

Method: Finding the Constant

Deep Dive 4

Worked Example 1: Basic Direct Proportion

Notes 5

Worked Example 2 (Higher): Proportional to Square

Notes 6

Knowledge Organiser: Proportion Graphs

Summary

Sample Flashcards

Finding k

Use given values to find constant k, then apply to new values

Direct vs Inverse

Direct: both increase together (y ∝ x). Inverse: one increases, other decreases (y ∝ 1/x).

Exam questions for Proportion Graphs

Which of the following describes the graph of a direct proportion relationship?

A. A curved line passing through the origin
B. A straight line passing through the origin
C. A straight line that crosses the y-axis above zero
D. A U-shaped curve symmetric about the y-axis

1 markfoundation

Aisha says: 'Because the graph of y against x is a straight line, y must be directly proportional to x.' Is Aisha correct? Explain your answer.

2 marksstandard

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