6.7 Solving Equations with Graphs

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Where graphs cross, you find solutions! In the final lesson of Chapter 6, solve equations using graphs, including the exam favourite: which line should I draw? You will learn: • The big idea: solutions are where graphs cross • Solving f(x) = 0 and f(x) = k with a horizontal line • Estimating x³ = 20 with a cubic graph • Finding where a curve meets a straight line • Rearranging an equation to choose the right line to draw • Why graph answers are estimates • Practice questions with full answers This is lesson 7 of 7 in Chapter 6: Graphs 6.1 Line segments 6.2 Straight-line graphs 6.3 Parallel and perpendicular lines 6.4 Travel graphs 6.5 Quadratic graphs 6.6 Gradient of a curve 6.7 Graphical solutions of equations (this lesson) © 2026 teachly.lk. All rights reserved. This lesson and its animations are original teachly.lk content. Please do not copy, download, re-upload or share it outside teachly.lk without permission. teachly.lk is an independent learning resource and is not affiliated with Cambridge Assessment International Education.

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