GCSE Maths, Unit 18, Lesson 3 of 5
Brainlag Plus

Rates of change from graphs

GCSE Maths, Rates, compound measures and growth, 25 minutes

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The gradient of a graph is a rate; the area under a speed-time graph is a distance; tangents give rates at an instant.

Gradient is a rate

On a distance-time graph the gradient is the speed; on a speed-time graph it is the acceleration; on a pay-hours graph it is the pay per hour.

A flat section means nothing is changing: stopped, or steady speed.

The rest of this lesson and its 7 practice questions are in Plus.

Screen 1 of 3, free to read.

  • 7 exam-style questions, marked as you go, each with a worked solution
  • The Graphing Calculator beside every question
  • Anything you get wrong is saved to your flashcards